<s>
Geocaching	B-Application
is	O
an	O
outdoor	O
recreational	O
activity	O
,	O
in	O
which	O
participants	O
use	O
a	O
Global	O
Positioning	O
System	O
(	O
GPS	O
)	O
receiver	O
or	O
mobile	B-Application
device	I-Application
and	O
other	O
navigational	O
techniques	O
to	O
hide	O
and	O
seek	O
containers	O
,	O
called	O
"	O
geocaches	O
"	O
or	O
"	O
caches	O
"	O
,	O
at	O
specific	O
locations	O
marked	O
by	O
coordinates	O
all	O
over	O
the	O
world	O
.	O
</s>
<s>
Geocaching	B-Application
can	O
be	O
considered	O
a	O
location-based	O
game	O
.	O
</s>
<s>
A	O
typical	O
cache	O
is	O
a	O
small	O
waterproof	O
container	O
containing	O
a	O
logbook	O
and	O
sometimes	O
a	O
pen	O
or	O
pencil	B-Device
.	O
</s>
<s>
The	O
geocacher	B-Application
signs	O
the	O
log	O
with	O
their	O
established	O
code	O
name	O
and	O
dates	O
it	O
,	O
in	O
order	O
to	O
prove	O
that	O
they	O
found	O
the	O
cache	O
.	O
</s>
<s>
Geocaching	B-Application
shares	O
many	O
aspects	O
with	O
benchmarking	O
,	O
trigpointing	O
,	O
orienteering	O
,	O
treasure	O
hunting	O
,	O
letterboxing	B-Operating_System
,	O
trail	O
blazing	O
,	O
and	O
Munzee	O
.	O
</s>
<s>
Geocaching	B-Application
was	O
originally	O
similar	O
to	O
the	O
game	O
letterboxing	B-Operating_System
(	O
which	O
originated	O
in	O
1854	O
)	O
,	O
which	O
uses	O
clues	O
and	O
references	O
to	O
landmarks	B-Protocol
embedded	O
in	O
stories	O
.	O
</s>
<s>
Geocaching	B-Application
was	O
conceived	O
shortly	O
after	O
the	O
removal	O
of	O
Selective	O
Availability	O
from	O
the	O
Global	O
Positioning	O
System	O
on	O
May	O
2	O
,	O
2000	O
(	O
Blue	O
Switch	O
Day	O
.	O
</s>
<s>
The	O
first	O
documented	O
placement	O
of	O
a	O
GPS-located	O
cache	O
took	O
place	O
on	O
May	O
3	O
,	O
2000	O
,	O
by	O
Dave	B-Application
Ulmer	I-Application
of	O
Beavercreek	O
,	O
Oregon	O
.	O
</s>
<s>
The	O
location	O
was	O
posted	O
on	O
the	O
Usenet	B-Application
newsgroup	I-Application
sci.geo.satellite-nav	O
at	O
.	O
</s>
<s>
According	O
to	O
Dave	B-Application
Ulmer	I-Application
's	O
message	O
,	O
this	O
cache	O
was	O
a	O
black	O
plastic	O
bucket	O
that	O
was	O
partially	O
buried	O
and	O
contained	O
software	O
,	O
videos	O
,	O
books	O
,	O
money	O
,	O
a	O
can	O
of	O
beans	O
,	O
and	O
a	O
slingshot	O
.	O
</s>
<s>
The	O
geocache	O
and	O
most	O
of	O
its	O
contents	O
were	O
eventually	O
destroyed	O
by	O
a	O
lawn	O
mower	O
;	O
the	O
can	O
of	O
beans	O
was	O
the	O
only	O
item	O
salvaged	O
and	O
was	O
turned	O
into	O
a	O
trackable	B-Operating_System
item	I-Operating_System
called	O
the	O
"	O
Original	O
Can	O
of	O
Beans	O
"	O
.	O
</s>
<s>
Geocaching	B-Application
company	O
Groundspeak	B-Application
allows	O
extraterrestrial	O
caches	O
,	O
e.g.	O
</s>
<s>
the	O
Moon	O
or	O
Mars	B-Application
,	O
although	O
presently	O
,	O
the	O
website	O
provides	O
only	O
earthbound	O
coordinates	O
.	O
</s>
<s>
The	O
original	O
cache	O
contained	O
a	O
travel	B-Operating_System
bug	I-Operating_System
(	O
the	O
first	O
geocaching	B-Application
trackable	B-Operating_System
item	I-Operating_System
in	O
space	O
)	O
,	O
which	O
stayed	O
on	O
the	O
station	O
until	O
it	O
was	O
brought	O
back	O
to	O
earth	O
in	O
2013	O
.	O
</s>
<s>
As	O
of	O
February	O
2021	O
,	O
only	O
one	O
confirmed	O
geocacher	B-Application
(	O
in	O
2013	O
)	O
has	O
actually	O
found	O
the	O
geocache	O
,	O
although	O
others	O
have	O
claimed	O
to	O
have	O
found	O
it	O
providing	O
varying	O
amounts	O
of	O
evidence	O
.	O
</s>
<s>
To	O
commemorate	O
the	O
occasion	O
,	O
Groundspeak	B-Application
allowed	O
specialized	O
geocaching	B-Application
events	O
to	O
be	O
published	O
across	O
the	O
world	O
,	O
allowing	O
attendees	O
to	O
obtain	O
a	O
virtual	O
souvenir	O
on	O
their	O
profile	O
.	O
</s>
<s>
The	O
second	O
geocaching	B-Application
trackable	B-Operating_System
in	O
space	O
is	O
TB5EFXK	O
which	O
is	O
attached	O
to	O
the	O
SHERLOC	O
calibration	O
target	O
on	O
board	O
the	O
Mars	B-Application
Perseverance	O
Rover	O
,	O
which	O
landed	O
on	O
Mars	B-Application
on	O
18	O
February	O
2021	O
.	O
</s>
<s>
Geocachers	B-Application
were	O
given	O
the	O
opportunity	O
to	O
virtually	O
discover	O
the	O
trackable	B-Operating_System
after	O
the	O
WATSON	O
camera	O
sent	O
back	O
its	O
first	O
photographs	O
of	O
the	O
calibration	O
target	O
that	O
contained	O
the	O
tracking	O
code	O
number	O
.	O
</s>
<s>
This	O
will	O
help	O
scientists	O
in	O
creating	O
a	O
viable	O
Martian	O
spacesuit	O
for	O
future	O
crewed	O
missions	O
to	O
Mars	B-Application
.	O
</s>
<s>
This	O
was	O
changed	O
shortly	O
after	O
the	O
original	O
hide	O
when	O
it	O
was	O
suggested	O
in	O
the	O
gpsstash	O
eGroup	B-Application
that	O
"	O
stash	O
"	O
could	O
have	O
negative	O
connotations	O
and	O
the	O
term	O
geocaching	B-Application
was	O
adopted	O
.	O
</s>
<s>
Over	O
time	O
,	O
a	O
variety	O
of	O
different	O
hide-and-seek-type	O
activities	O
have	O
been	O
created	O
or	O
abandoned	O
,	O
so	O
that	O
"	O
geocaching	B-Application
"	O
may	O
now	O
refer	O
to	O
hiding	O
and	O
seeking	O
containers	O
,	O
or	O
locations	O
or	O
information	O
without	O
containers	O
.	O
</s>
<s>
An	O
independent	O
accounting	O
of	O
the	O
early	O
history	O
documents	O
several	O
controversial	O
actions	O
taken	O
by	O
Jeremy	O
Irish	O
and	O
Grounded	O
,	O
Inc.	O
,	O
a	O
predecessor	O
to	O
Groundspeak	B-Application
,	O
to	O
increase	O
"	O
commercialization	O
and	O
monopolistic	O
control	O
over	O
the	O
hobby	O
"	O
.	O
</s>
<s>
More	O
recently	O
,	O
other	O
similar	O
hobbies	O
such	O
as	O
Munzee	O
have	O
attracted	O
some	O
geocachers	B-Application
by	O
rapidly	O
adopting	O
smart-phone	O
technology	O
,	O
which	O
has	O
caused	O
"	O
some	O
resistance	O
from	O
geocaching	B-Application
organizers	O
about	O
placing	O
caches	O
along	O
with	O
Munzees	O
"	O
.	O
</s>
<s>
For	O
the	O
traditional	O
geocache	O
,	O
a	O
geocacher	B-Application
will	O
place	O
a	O
waterproof	O
container	O
containing	O
a	O
log	O
book	O
(	O
with	O
pen	O
and/or	O
pencil	B-Device
)	O
and	O
trade	O
items	O
or	O
trackables	B-Operating_System
,	O
then	O
record	O
the	O
cache	O
's	O
coordinates	O
.	O
</s>
<s>
Other	O
geocachers	B-Application
obtain	O
the	O
coordinates	O
from	O
that	O
listing	O
site	O
and	O
seek	O
out	O
the	O
cache	O
using	O
their	O
handheld	B-Application
GPS	O
receivers	O
.	O
</s>
<s>
The	O
finding	O
geocachers	B-Application
record	O
their	O
exploits	O
in	O
the	O
logbook	O
and	O
online	O
,	O
but	O
then	O
must	O
return	O
the	O
cache	O
to	O
the	O
same	O
coordinates	O
so	O
that	O
other	O
geocachers	B-Application
may	O
find	O
it	O
.	O
</s>
<s>
Geocachers	B-Application
are	O
free	O
to	O
take	O
objects	O
(	O
except	O
the	O
logbook	O
,	O
pencil	B-Device
,	O
or	O
stamp	O
)	O
from	O
the	O
cache	O
in	O
exchange	O
for	O
leaving	O
something	O
of	O
similar	O
or	O
higher	O
value	O
.	O
</s>
<s>
Typical	O
cache	O
"	O
treasures	O
"	O
,	O
also	O
known	O
in	O
the	O
geocaching	B-Application
world	O
as	O
SWAG	O
(	O
a	O
backronym	O
of	O
"	O
stuff	O
we	O
all	O
get	O
"	O
)	O
,	O
are	O
not	O
high	O
in	O
monetary	O
value	O
but	O
may	O
hold	O
personal	O
value	O
to	O
the	O
finder	O
.	O
</s>
<s>
Although	O
not	O
required	O
,	O
many	O
geocachers	B-Application
decide	O
to	O
leave	O
behind	O
signature	O
items	O
,	O
such	O
as	O
personal	O
geocoins	B-Application
,	O
pins	O
,	O
or	O
craft	O
items	O
,	O
to	O
mark	O
their	O
presence	O
at	O
the	O
cache	O
location	O
.	O
</s>
<s>
Disposable	O
cameras	O
are	O
popular	O
as	O
they	O
allow	O
for	O
anyone	O
who	O
found	O
the	O
cache	O
to	O
take	O
a	O
picture	O
which	O
can	O
be	O
developed	O
and	O
uploaded	O
to	O
a	O
Geocaching	B-Application
web	O
site	O
listed	O
below	O
.	O
</s>
<s>
Also	O
common	O
are	O
objects	O
that	O
are	O
moved	O
from	O
cache	O
to	O
cache	O
called	O
"	O
hitchhikers	O
"	O
,	O
such	O
as	O
Travel	B-Operating_System
Bugs	I-Operating_System
or	O
geocoins	B-Application
,	O
whose	O
travels	O
may	O
be	O
logged	O
and	O
followed	O
online	O
.	O
</s>
<s>
Cachers	O
who	O
initially	O
place	O
a	O
Travel	B-Operating_System
Bug	I-Operating_System
or	O
geocoin(s )	O
often	O
assign	O
specific	O
goals	O
for	O
their	O
trackable	B-Operating_System
items	O
.	O
</s>
<s>
If	O
a	O
geocache	O
has	O
been	O
vandalized	O
or	O
stolen	O
by	O
a	O
person	O
who	O
is	O
not	O
familiar	O
with	O
geocaching	B-Application
,	O
it	O
is	O
said	O
to	O
have	O
been	O
"	O
muggled	O
"	O
.	O
</s>
<s>
The	O
term	O
plays	O
off	O
the	O
fact	O
that	O
those	O
not	O
familiar	O
with	O
geocaching	B-Application
are	O
called	O
muggles	O
,	O
a	O
word	O
borrowed	O
from	O
the	O
Harry	O
Potter	O
series	O
of	O
books	O
which	O
were	O
rising	O
in	O
popularity	O
at	O
the	O
same	O
time	O
geocaching	B-Application
started	O
.	O
</s>
<s>
Traditional	O
geocaching	B-Application
gave	O
birth	O
to	O
GeoCaching	B-Application
–	O
an	O
active	O
urban	O
game	O
of	O
the	O
Encounter	O
project	O
.	O
</s>
<s>
The	O
game	O
is	O
quite	O
similar	O
to	O
geocaching	B-Application
but	O
has	O
time	O
limitations	O
and	O
hints	O
.	O
</s>
<s>
Different	O
geocaching	B-Application
websites	O
list	O
different	O
variations	O
per	O
their	O
own	O
policies	O
.	O
</s>
<s>
The	O
following	O
cache	O
types	O
are	O
supported	O
by	O
geocaching.com	O
.	O
</s>
<s>
the	O
first	O
stage	O
is	O
a	O
historical	O
marker	O
where	O
geocachers	B-Application
have	O
to	O
answer	O
questions	O
to	O
calculate	O
the	O
coordinates	O
to	O
the	O
final	O
physical	O
container	O
)	O
.	O
</s>
<s>
Some	O
puzzles	O
can	O
be	O
easy	O
and	O
involve	O
basic	O
math	O
operations	O
or	O
they	O
can	O
be	O
quite	O
difficult	O
,	O
with	O
some	O
of	O
the	O
more	O
challenging	O
ones	O
requiring	O
a	O
firm	O
understanding	O
of	O
computer	B-General_Concept
programming	I-General_Concept
.	O
</s>
<s>
Geocaching	B-Application
Toolbox	O
,	O
a	O
website	O
dedicated	O
to	O
create	O
and	O
solve	O
puzzle	O
geocaches	O
,	O
provides	O
a	O
comprehensive	O
list	O
of	O
common	O
puzzle	O
cache	O
ciphers	O
.	O
</s>
<s>
Challenge	O
caches	O
require	O
a	O
geocacher	B-Application
to	O
complete	O
a	O
reasonably	O
attainable	O
geocaching-related	O
task	O
before	O
being	O
able	O
to	O
log	O
the	O
cache	O
as	O
a	O
find	O
online	O
.	O
</s>
<s>
It	O
does	O
not	O
restrict	O
geocachers	B-Application
from	O
finding	O
the	O
cache	O
and	O
signing	O
the	O
logbook	O
at	O
anytime	O
.	O
</s>
<s>
However	O
a	O
geocacher	B-Application
is	O
not	O
allowed	O
to	O
log	O
a	O
find	O
on	O
the	O
geocaching	B-Application
website	O
unless	O
they	O
qualify	O
for	O
the	O
challenge	O
specified	O
in	O
the	O
cache	O
description	O
.	O
</s>
<s>
Since	O
2017	O
,	O
Groundspeak	B-Application
has	O
required	O
new	O
challenges	O
to	O
have	O
a	O
"	O
geochecker	O
"	O
in	O
which	O
users	O
can	O
put	O
their	O
name	O
into	O
an	O
algorithm	O
to	O
see	O
if	O
they	O
qualify	O
without	O
the	O
need	O
of	O
physically	O
checking	O
all	O
of	O
one	O
's	O
previous	O
finds	O
.	O
</s>
<s>
Groundspeak	B-Application
also	O
has	O
been	O
more	O
strict	O
into	O
what	O
types	O
of	O
challenges	O
are	O
published	O
.	O
</s>
<s>
Under	O
current	O
guidelines	O
,	O
this	O
is	O
no	O
longer	O
allowed	O
because	O
it	O
restricts	O
geocachers	B-Application
to	O
find	O
specific	O
geocaches	O
.	O
</s>
<s>
Instead	O
,	O
Groundspeak	B-Application
has	O
encouraged	O
new	O
challenges	O
to	O
be	O
more	O
creative	O
.	O
</s>
<s>
This	O
cache	O
has	O
been	O
discontinued	O
at	O
geocaching.com	O
and	O
those	O
that	O
have	O
been	O
grandfathered	O
in	O
are	O
solely	O
declining	O
and	O
are	O
being	O
archived	O
.	O
</s>
<s>
Garmin	O
chirp	O
Brings	O
Geocachers	B-Application
Even	O
More	O
Creativity	O
,	O
Connectivity	O
,	O
published	O
October	O
15	O
,	O
2010Garmin	O
Chirp	O
,	O
retrieved	O
January	O
13	O
,	O
2013	O
These	O
caches	O
caused	O
considerable	O
discussion	O
and	O
some	O
controversy	O
at	O
Groundspeak	B-Application
,	O
where	O
they	O
were	O
ultimately	O
given	O
a	O
new	O
"	O
attribute	O
"	O
.Garmin	O
Chirp	O
-	O
Geocaching	B-Application
Beacon	O
,	O
retrieved	O
January	O
13	O
,	O
2013	O
These	O
types	O
of	O
geocaches	O
can	O
also	O
be	O
listed	O
as	O
a	O
traditional	O
,	O
multi-cache	O
,	O
or	O
letterbox	B-Operating_System
.	O
</s>
<s>
Considered	O
a	O
variant	O
of	O
the	O
Mystery	O
cache	O
on	O
geocaching.com.Geocaching	O
HQ	O
Geocache	O
,	O
(	O
GCK25B	O
)	O
,	O
is	O
the	O
official	O
geocache	O
located	O
inside	O
the	O
Groundspeak	B-Application
headquarters	O
office	O
in	O
Seattle	O
,	O
Washington	O
.	O
</s>
<s>
It	O
is	O
technically	O
classified	O
as	O
a	O
separate	O
cache	O
type	O
under	O
mystery	O
caches	O
,	O
with	O
its	O
own	O
unique	O
icon	O
both	O
on	O
the	O
geocaching	B-Application
app	O
and	O
on	O
one	O
's	O
profile	O
statistics	O
tab	O
.	O
</s>
<s>
A	O
Wherigo	B-Application
cache	O
is	O
a	O
multi-stage	O
cache	O
hunt	O
that	O
uses	O
a	O
Wherigo	B-Application
"	O
cartridge	O
"	O
to	O
guide	O
players	O
to	O
find	O
a	O
physical	O
cache	O
sometime	O
during	O
cartridge	O
play	O
,	O
usually	O
at	O
the	O
end	O
.	O
</s>
<s>
However	O
,	O
not	O
all	O
Wherigo	B-Application
cartridges	O
incorporate	O
geocaches	O
into	O
gameplay	O
.	O
</s>
<s>
Wherigo	B-Application
caches	O
are	O
unique	O
to	O
the	O
geocaching.com	O
website	O
.	O
</s>
<s>
Wherigo	B-Application
is	O
a	O
GPS	O
location-aware	O
software	O
platform	O
initially	O
released	O
in	O
January	O
2008	O
.	O
</s>
<s>
Authors	O
can	O
develop	O
self-enclosed	O
story	O
files	O
(	O
called	O
"	O
cartridges	O
"	O
)	O
that	O
are	O
read	O
by	O
the	O
Wherigo	B-Application
player	O
software	O
,	O
installed	O
on	O
either	O
a	O
GPS	O
unit	O
or	O
smartphone	O
.	O
</s>
<s>
Cartridges	O
are	O
coded	O
in	O
Lua	B-Language
.	O
</s>
<s>
Lua	B-Language
may	O
be	O
used	O
directly	O
,	O
but	O
a	O
builder	O
application	O
is	O
usually	O
used	O
.	O
</s>
<s>
The	O
Wherigo	B-Application
site	O
offers	O
a	O
builder	O
application	O
and	O
a	O
database	O
of	O
adventures	O
free	O
for	O
download	O
,	O
though	O
the	O
builder	O
has	O
remained	O
in	O
its	O
Alpha	O
version	O
since	O
its	O
last	O
release	O
in	O
May	O
2008	O
.	O
</s>
<s>
The	O
official	O
player	O
is	O
only	O
available	O
for	O
Pocket	B-Device
PC	I-Device
.	O
</s>
<s>
The	O
Wherigo	B-Application
Foundation	O
was	O
organized	O
in	O
December	O
2012	O
.	O
</s>
<s>
The	O
group	O
is	O
composed	O
of	O
all	O
Wherigo	B-Application
application	O
developers	O
who	O
,	O
up	O
until	O
that	O
time	O
,	O
had	O
been	O
acting	O
and	O
developing	O
separately	O
.	O
</s>
<s>
Their	O
goal	O
is	O
to	O
provide	O
a	O
consistent	O
Wherigo	B-Application
experience	O
across	O
platforms	O
,	O
connect	O
Wherigo	B-Application
applications	O
via	O
an	O
API	B-General_Concept
,	O
and	O
add	O
modern	O
features	O
to	O
the	O
Wherigo	B-Application
platform	O
.	O
</s>
<s>
While	O
Groundspeak	B-Application
is	O
aware	O
of	O
this	O
project	O
,	O
the	O
company	O
has	O
yet	O
to	O
take	O
a	O
position	O
.	O
</s>
<s>
More	O
recently	O
,	O
a	O
new	O
type	O
of	O
Wherigo	B-Application
has	O
been	O
exploding	O
in	O
popularity	O
called	O
a	O
Reverse	O
Wherigo	B-Application
.	O
</s>
<s>
It	O
requires	O
geocachers	B-Application
to	O
get	O
closer	O
to	O
the	O
final	O
geocache	O
by	O
process	O
of	O
elimination	O
.	O
</s>
<s>
A	O
Letterbox	B-Operating_System
cache	O
or	O
a	O
Letterbox	B-Operating_System
hybrid	O
cache	O
is	O
a	O
combination	O
of	O
a	O
geocache	O
and	O
a	O
letterbox	B-Operating_System
in	O
the	O
same	O
container	O
.	O
</s>
<s>
A	O
letterbox	B-Operating_System
has	O
a	O
rubber	O
stamp	O
and	O
a	O
logbook	O
instead	O
of	O
tradable	O
items	O
.	O
</s>
<s>
Letterboxers	B-Operating_System
carry	O
their	O
own	O
stamp	O
with	O
them	O
,	O
to	O
stamp	O
the	O
letterbox	B-Operating_System
's	O
log	O
book	O
and	O
inversely	O
stamp	O
their	O
personal	O
log	O
book	O
with	O
the	O
letterbox	B-Operating_System
stamp	O
.	O
</s>
<s>
or	O
simply	O
Ape	O
Caches	O
are	O
a	O
special	O
type	O
of	O
traditional	O
geocache	O
that	O
were	O
hidden	O
in	O
conjunction	O
with	O
20th	O
Century	O
Fox	O
and	O
Groundspeak	B-Application
to	O
promote	O
the	O
2001	O
remake	O
of	O
Planet	B-Application
of	I-Application
the	I-Application
Apes	I-Application
.	O
</s>
<s>
However	O
,	O
the	O
original	O
container	O
was	O
later	O
found	O
by	O
a	O
Groundspeak	B-Application
led	O
survey	O
in	O
April	O
of	O
that	O
year	O
.	O
</s>
<s>
Groundspeak	B-Application
created	O
a	O
waymarking	O
website	O
to	O
handle	O
all	O
other	O
non-physical	O
caches.Virtual	O
caches	O
are	O
coordinates	O
for	O
a	O
rather	O
interesting	O
or	O
unique	O
location	O
,	O
usually	O
with	O
a	O
described	O
object	O
such	O
as	O
an	O
art	O
sculpture	O
or	O
a	O
scenic	O
lookout	O
.	O
</s>
<s>
As	O
of	O
2005	O
,	O
new	O
virtual	O
caches	O
are	O
no	O
longer	O
allowed	O
by	O
Groundspeak	B-Application
as	O
it	O
is	O
considered	O
a	O
legacy	O
cache	O
.	O
</s>
<s>
On	O
August	O
24	O
,	O
2017	O
,	O
Groundspeak	B-Application
announced	O
"	O
Virtual	O
Rewards	O
"	O
,	O
allowing	O
4000	O
new	O
virtual	O
caches	O
to	O
be	O
placed	O
during	O
the	O
following	O
year	O
.	O
</s>
<s>
Each	O
year	O
,	O
eligible	O
geocachers	B-Application
can	O
opt-in	O
to	O
a	O
drawing	O
and	O
some	O
selected	O
with	O
the	O
opportunity	O
to	O
submit	O
a	O
virtual	O
cache	O
for	O
publication	O
.	O
</s>
<s>
From	O
2005	O
to	O
2017	O
,	O
the	O
geocaching	B-Application
website	O
no	O
longer	O
listed	O
new	O
caches	O
without	O
a	O
physical	O
container	O
,	O
including	O
virtual	O
and	O
webcam	B-Protocol
caches	O
(	O
with	O
the	O
exception	O
of	O
earthcaches	O
and	O
events	O
)	O
;	O
however	O
,	O
older	O
caches	O
of	O
these	O
types	O
have	O
been	O
grandfathered	O
in	O
(	O
except	O
for	O
locationless	O
or	O
reverse	O
,	O
which	O
are	O
completely	O
archived	O
and	O
transferred	O
to	O
Waymarking.com	O
)	O
.	O
</s>
<s>
Earthcaches	O
covers	O
geologic	O
topics	O
such	O
as	O
:	O
rock	O
formation	O
,	O
mineralogy	O
,	O
earthquakes	O
,	O
fluvial	O
processes	O
,	O
erosion	B-Algorithm
,	O
volcanology	O
,	O
and	O
planetary	O
science	O
(	O
among	O
others	O
)	O
.Locationless	O
(	O
reverse	O
)	O
caches	O
are	O
similar	O
to	O
a	O
scavenger	O
hunt	O
.	O
</s>
<s>
However	O
,	O
with	O
geocaching	B-Application
's	O
20th	O
anniversary	O
in	O
2020	O
Groundspeak	B-Application
decided	O
to	O
publish	O
a	O
special	O
locationless	O
cache	O
for	O
geocachers	B-Application
to	O
"	O
find	O
"	O
at	O
various	O
Mega	O
and	O
Giga	O
events	O
around	O
the	O
world	O
.	O
</s>
<s>
The	O
first	O
locationless	O
geocache	O
in	O
15	O
years	O
(	O
GC8FR0G	O
)	O
required	O
finders	O
to	O
take	O
a	O
picture	O
of	O
themselves	O
with	O
the	O
geocaching	B-Application
mascot	O
,	O
Signal	O
the	O
Frog	O
,	O
at	O
Mega	O
and	O
Giga	O
Events	O
during	O
2020	O
.	O
</s>
<s>
Therefore	O
,	O
Groundspeak	B-Application
decided	O
to	O
extend	O
the	O
deadline	O
to	O
log	O
this	O
geocache	O
through	O
1	O
January	O
2023	O
.	O
</s>
<s>
Geocachers	B-Application
were	O
able	O
to	O
log	O
this	O
cache	O
from	O
6	O
February	O
2021	O
through	O
31	O
December	O
2022	O
.	O
</s>
<s>
On	O
17	O
August	O
2022	O
,	O
Geocaching	B-Application
made	O
available	O
the	O
3rd	O
locationless	O
cache	O
to	O
be	O
logged	O
since	O
2005	O
(	O
GC9FAVE	O
)	O
.	O
</s>
<s>
Instead	O
of	O
finding	O
Signal	O
or	O
picking	O
up	O
trash	O
,	O
this	O
cache	O
encouraged	O
geocachers	B-Application
from	O
around	O
the	O
world	O
to	O
share	O
their	O
favorite	O
geocaching	B-Application
story	O
.	O
</s>
<s>
This	O
geocache	O
will	O
be	O
archived	O
and	O
locked	O
on	O
1	O
January	O
2024.Webcam	O
caches	O
are	O
a	O
type	O
of	O
virtual	O
cache	O
whose	O
coordinates	O
provide	O
the	O
location	O
to	O
a	O
public	O
webcam	B-Protocol
.	O
</s>
<s>
The	O
finder	O
is	O
required	O
to	O
capture	O
an	O
image	O
of	O
themselves	O
through	O
the	O
webcam	B-Protocol
for	O
verification	O
of	O
the	O
find	O
.	O
</s>
<s>
New	O
webcam	B-Protocol
caches	O
are	O
no	O
longer	O
allowed	O
by	O
Groundspeak	B-Application
as	O
it	O
is	O
a	O
legacy	O
cache	O
.	O
</s>
<s>
Webcam	B-Protocol
caches	O
are	O
a	O
category	O
at	O
Waymarking.com.Adventure	O
Lab	O
caches	O
(	O
ALs	O
)	O
are	O
a	O
type	O
of	O
virtual	O
cache	O
that	O
typically	O
consists	O
of	O
a	O
set	O
of	O
5	O
or	O
10	O
waypoints	O
,	O
with	O
each	O
waypoint	O
counting	O
as	O
a	O
"	O
cache	O
find	O
"	O
.	O
</s>
<s>
Adventure	O
labs	O
were	O
first	O
introduced	O
in	O
2014	O
as	O
a	O
way	O
to	O
test	O
market	O
ideas	O
through	O
Groundspeak	B-Application
.	O
</s>
<s>
Initially	O
,	O
geocachers	B-Application
would	O
find	O
a	O
key	O
word	O
at	O
a	O
designated	O
site	O
where	O
they	O
could	O
then	O
enter	O
it	O
onto	O
a	O
website	O
to	O
claim	O
"	O
credit	O
"	O
.	O
</s>
<s>
In	O
2020	O
,	O
Groundspeak	B-Application
released	O
the	O
"	O
Adventure	O
Lab	O
"	O
app	O
,	O
separate	O
from	O
the	O
Geocaching	B-Application
app	O
.	O
</s>
<s>
Geocachers	B-Application
can	O
create	O
their	O
own	O
Adventure	O
Lab	O
,	O
but	O
must	O
first	O
opt-in	O
to	O
receive	O
an	O
"	O
adventure	O
lab	O
credit	O
"	O
which	O
allows	O
for	O
the	O
creation	O
of	O
1	O
set	O
of	O
5	O
waypoints	O
,	O
with	O
each	O
of	O
the	O
5	O
waypoints	O
counting	O
towards	O
a	O
cache	O
find	O
.	O
</s>
<s>
Adventure	O
Labs	O
,	O
unlike	O
all	O
other	O
geocachers	B-Application
,	O
are	O
not	O
subject	O
to	O
review	O
and	O
are	O
published	O
at	O
will	O
by	O
the	O
creator	O
.	O
</s>
<s>
However	O
,	O
ALs	O
can	O
at	O
anytime	O
be	O
archived	O
by	O
Groundspeak	B-Application
if	O
they	O
are	O
in	O
violation	O
of	O
terms	O
of	O
use	O
.	O
</s>
<s>
An	O
Event	O
Cache	O
is	O
a	O
gathering	O
organized	O
and	O
attended	O
by	O
geocachers	B-Application
.	O
</s>
<s>
It	O
is	O
not	O
a	O
true	O
cache	O
,	O
but	O
is	O
treated	O
as	O
such	O
by	O
geocaching	B-Application
platforms	O
:	O
it	O
can	O
be	O
"	O
found	O
"	O
upon	O
attending	O
the	O
event	O
.	O
</s>
<s>
CITO	O
is	O
an	O
ongoing	O
environmental	O
initiative	O
created	O
by	O
Groundspeak	B-Application
and	O
encourages	O
geocachers	B-Application
to	O
clean	O
up	O
parks	O
and	O
other	O
areas	O
in	O
which	O
they	O
frequently	O
visit	O
while	O
geocaching	B-Application
.	O
</s>
<s>
A	O
Mega	O
Event	O
is	O
a	O
gathering	O
that	O
consists	O
of	O
500	O
or	O
more	O
geocachers	B-Application
.	O
</s>
<s>
Mega	O
events	O
are	O
typically	O
organized	O
by	O
a	O
local	O
geocache	O
organizations	O
in	O
conjunction	O
with	O
local	O
municipalities	O
and	O
promotion	O
from	O
Groundspeak	B-Application
.	O
</s>
<s>
These	O
activities	O
can	O
range	O
in	O
raffles	O
and	O
silent	O
auctions	O
,	O
of	O
which	O
funds	O
help	O
offset	O
the	O
costs	O
of	O
organizing	O
such	O
an	O
event	O
,	O
photo	O
ops	O
with	O
Signal	O
the	O
Frog	O
,	O
a	O
plethora	O
of	O
new	O
geocaches	O
,	O
and	O
panels	O
with	O
local	O
geocachers	B-Application
,	O
lackeys	O
(	O
Groundspeak	B-Application
employees	O
)	O
,	O
and	O
reviewers	O
.	O
</s>
<s>
Mega	O
events	O
often	O
have	O
vendors	O
where	O
people	O
can	O
purchase	O
geocoins	B-Application
,	O
cache	O
containers	O
,	O
and	O
food	O
.	O
</s>
<s>
A	O
Giga	O
Event	O
is	O
a	O
gathering	O
that	O
consists	O
of	O
5,000	O
or	O
more	O
geocachers	B-Application
.	O
</s>
<s>
Usually	O
the	O
week	O
before	O
and	O
after	O
are	O
filled	O
with	O
smaller	O
gatherings	O
which	O
attracts	O
geocachers	B-Application
from	O
around	O
the	O
world	O
who	O
often	O
make	O
a	O
vacation	O
out	O
of	O
it	O
.	O
</s>
<s>
A	O
GPS	O
Adventures	O
Maze	O
Exhibit	O
is	O
an	O
exhibit	O
at	O
various	O
museums	O
and	O
science	O
centers	O
in	O
which	O
participants	O
in	O
the	O
maze	O
learn	O
about	O
geocaching	B-Application
.	O
</s>
<s>
These	O
"	O
events	O
"	O
have	O
their	O
own	O
cache	O
type	O
on	O
geocaching.com	O
and	O
include	O
many	O
non-geocachers	O
.	O
</s>
<s>
A	O
Community	O
Celebration	O
Event	O
or	O
CCE	O
is	O
a	O
type	O
of	O
event	O
that	O
is	O
meant	O
to	O
celebrate	O
the	O
10th	O
and	O
20th	O
anniversary	O
of	O
geocaching	B-Application
.	O
</s>
<s>
First	O
issued	O
in	O
2010	O
as	O
"	O
Lost	O
and	O
Found	O
"	O
events	O
,	O
geocachers	B-Application
could	O
host	O
one	O
to	O
celebrate	O
the	O
10	O
year	O
anniversary	O
of	O
geocaching	B-Application
.	O
</s>
<s>
Geocachers	B-Application
could	O
opt-in	O
to	O
receive	O
a	O
CCE	O
credit	O
to	O
host	O
.	O
</s>
<s>
Due	O
to	O
the	O
Covid-19	O
Pandemic	O
Groundspeak	B-Application
allowed	O
CCEs	O
to	O
be	O
hosted	O
until	O
31	O
December	O
2022	O
.	O
</s>
<s>
Geocachers	B-Application
may	O
upload	O
geocache	O
data	O
(	O
also	O
known	O
as	O
waypoints	O
)	O
from	O
various	O
websites	O
in	O
various	O
formats	O
,	O
most	O
commonly	O
in	O
file-type	O
GPX	O
,	O
which	O
uses	O
XML	B-Protocol
.	O
</s>
<s>
Some	O
websites	O
allow	O
geocachers	B-Application
to	O
search	O
(	O
build	O
queries	O
)	O
for	O
multiple	O
caches	O
within	O
a	O
geographic	O
area	O
based	O
on	O
criteria	O
such	O
as	O
ZIP	O
code	O
or	O
coordinates	O
,	O
downloading	O
the	O
results	O
as	O
an	O
email	O
attachment	O
on	O
a	O
schedule	O
.	O
</s>
<s>
In	O
recent	O
years	O
,	O
Android	B-Application
and	O
iPhone	B-Device
users	O
can	O
download	O
apps	O
such	O
as	O
GeoBeagle	O
that	O
allow	O
them	O
to	O
use	O
their	O
3G	O
and	O
GPS-enabled	O
devices	O
to	O
actively	O
search	O
for	O
and	O
download	O
new	O
caches	O
.	O
</s>
<s>
A	O
variety	O
of	O
geocaching	B-Application
applications	O
are	O
available	O
for	O
geocache	O
data	O
management	O
,	O
file-type	O
translation	O
,	O
and	O
personalization	O
.	O
</s>
<s>
Geocaching	B-Application
software	O
can	O
assign	O
special	O
icons	O
or	O
search	O
(	O
filter	O
)	O
for	O
caches	O
based	O
on	O
certain	O
criteria	O
(	O
e.g.	O
</s>
<s>
Traditionally	O
,	O
this	O
means	O
that	O
the	O
seeker	O
has	O
an	O
electronic	O
means	O
of	O
viewing	O
the	O
cache	O
information	O
in	O
the	O
field	O
,	O
such	O
as	O
pre-downloading	O
the	O
information	O
to	O
a	O
PDA	B-Application
or	O
other	O
electronic	O
device	O
.	O
</s>
<s>
Newer	O
GPS	O
devices	O
released	O
by	O
Garmin	O
,	O
DeLorme	O
,	O
and	O
Magellan	O
have	O
the	O
ability	O
to	O
read	O
GPX	O
files	O
directly	O
,	O
thus	O
eliminating	O
the	O
need	O
for	O
a	O
PDA	B-Application
.	O
</s>
<s>
The	O
website	O
geocaching.com	O
now	O
sells	O
mobile	O
applications	O
which	O
allow	O
users	O
to	O
view	O
caches	O
through	O
a	O
variety	O
of	O
different	O
devices	O
.	O
</s>
<s>
Currently	O
,	O
the	O
Android	B-Application
,	O
iPhone	B-Device
,	O
and	O
Windows	B-Protocol
Phone	I-Protocol
mobile	B-Application
platforms	I-Application
have	O
applications	O
in	O
their	O
respective	O
stores	O
.	O
</s>
<s>
The	O
site	O
promotes	O
mobile	O
applications	O
,	O
and	O
lists	O
over	O
two	O
dozen	O
applications	O
(	O
both	O
mobile	O
and	O
browser/desktop	O
based	O
)	O
that	O
are	O
using	O
their	O
proprietary	B-Application
but	O
royalty-free	O
public	O
application	B-General_Concept
programming	I-General_Concept
interface	O
(	O
API	B-General_Concept
)	O
.	O
</s>
<s>
Developers	O
at	O
c:geo	O
have	O
criticised	O
Groundspeak	B-Application
for	O
being	O
incompatible	O
with	O
open-source	O
development	O
.	O
</s>
<s>
Additionally	O
"	O
c:geo	O
-	O
opensource	O
"	O
is	O
a	O
free	O
opensource	O
full	O
function	O
application	O
for	O
Android	B-Application
phones	I-Application
that	O
is	O
very	O
popular	O
.	O
</s>
<s>
This	O
app	O
includes	O
similar	O
features	O
to	O
the	O
official	O
Geocaching	B-Application
mobile	O
application	O
,	O
such	O
as	O
:	O
View	O
caches	O
on	O
a	O
live	O
map	O
(	O
Google	O
Maps	O
or	O
OpenStreetMap	O
)	O
,	O
navigation	O
using	O
a	O
compass	O
,	O
map	O
,	O
or	O
other	O
applications	O
,	O
logging	O
finds	O
online	O
and	O
offline	O
,	O
etc	O
.	O
</s>
<s>
Geocaching	B-Application
enthusiasts	O
have	O
also	O
made	O
their	O
own	O
hand-held	B-Application
GPS	O
devices	O
using	O
a	O
Lego	B-Application
Mindstorms	I-Application
NXT	I-Application
GPS	O
sensor	O
.	O
</s>
<s>
Government	O
agencies	O
and	O
others	O
responsible	O
for	O
public	O
use	O
of	O
land	O
often	O
publish	O
guidelines	O
for	O
geocaching	B-Application
,	O
and	O
a	O
"	O
Geocacher	B-Application
's	O
Creed	O
"	O
posted	O
on	O
the	O
Internet	O
asks	O
participants	O
to	O
"	O
avoid	O
causing	O
disruptions	O
or	O
public	O
alarm	O
"	O
.Fredrick	O
Kunkle	O
,	O
Geocaching	B-Application
Craze	O
Pushes	O
Officials	O
To	O
Set	O
Guidelines	O
,	O
Washington	O
Post	O
,	O
September	O
27	O
,	O
2007	O
.	O
</s>
<s>
thumb|The	O
Shambles	O
,	O
a	O
road	O
in	O
Wetherby	O
,	O
Yorkshire	O
,	O
England	O
,	O
was	O
the	O
site	O
of	O
a	O
controlled	O
explosion	O
on	O
a	O
geocache	O
container	O
in	O
2011	O
which	O
was	O
mistakenly	O
perceived	O
to	O
be	O
a	O
bomb	B-Device
.	O
</s>
<s>
Other	O
times	O
,	O
investigation	O
of	O
a	O
cache	O
location	O
after	O
suspicious	O
activity	O
was	O
reported	O
has	O
resulted	O
in	O
police	O
and	O
bomb	B-Device
squad	O
discovery	O
of	O
the	O
geocache	O
,	O
such	O
as	O
the	O
evacuation	O
of	O
a	O
busy	O
street	O
in	O
Wetherby	O
,	O
Yorkshire	O
,	O
England	O
in	O
2011	O
,	O
and	O
a	O
street	O
in	O
Alvaston	O
,	O
Derby	O
in	O
2020	O
.	O
</s>
<s>
A	O
number	O
of	O
caches	O
have	O
been	O
destroyed	O
by	O
bomb	B-Device
squads	O
.	O
</s>
<s>
Some	O
geocachers	B-Application
act	O
to	O
mitigate	O
this	O
perception	O
by	O
picking	O
up	O
litter	O
while	O
they	O
search	O
for	O
geocaches	O
,	O
a	O
practice	O
referred	O
to	O
in	O
the	O
community	O
as	O
"	O
Cache	B-Application
In	I-Application
Trash	I-Application
Out	I-Application
"	O
.	O
</s>
<s>
Geocachers	B-Application
are	O
also	O
encouraged	O
to	O
clean	O
up	O
after	O
themselves	O
by	O
retrieving	O
old	O
containers	O
once	O
a	O
cache	O
has	O
been	O
removed	O
from	O
play	O
.	O
</s>
<s>
Geocaching	B-Application
is	O
legal	O
in	O
most	O
countries	O
and	O
is	O
usually	O
positively	O
received	O
when	O
explained	O
to	O
law	O
enforcement	O
officials	O
.	O
</s>
<s>
Historic	O
buildings	O
and	O
structures	O
have	O
also	O
been	O
damaged	O
by	O
geocachers	B-Application
,	O
who	O
have	O
wrongly	O
believed	O
the	O
geocache	O
to	O
be	O
placed	O
within	O
,	O
or	O
on	O
the	O
roof	O
of	O
,	O
the	O
buildings	O
.	O
</s>
<s>
Caches	O
might	O
also	O
be	O
hidden	O
in	O
places	O
where	O
the	O
act	O
of	O
searching	O
can	O
make	O
a	O
finder	O
look	O
suspicious	O
(	O
e.g.	O
,	O
near	O
schools	O
,	O
children	O
's	O
playgrounds	O
,	O
banks	O
,	O
courthouses	O
,	O
or	O
in	O
residential	O
neighborhoods	O
)	O
,	O
or	O
where	O
the	O
container	O
placement	O
could	O
be	O
mistaken	O
for	O
a	O
drug	O
stash	O
or	O
a	O
bomb	B-Device
(	O
especially	O
in	O
urban	O
settings	O
,	O
under	O
bridges	O
,	O
near	O
banks	O
,	O
courthouses	O
,	O
or	O
embassies	O
)	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
geocachers	B-Application
are	O
strongly	O
advised	O
to	O
label	O
their	O
geocaches	O
where	O
possible	O
,	O
so	O
that	O
they	O
are	O
not	O
mistaken	O
for	O
a	O
harmful	O
object	O
if	O
discovered	O
by	O
non-geocachers	O
.	O
</s>
<s>
As	O
well	O
as	O
concerns	O
about	O
littering	O
and	O
bomb	B-Device
threats	O
,	O
some	O
geocachers	B-Application
have	O
hidden	O
their	O
caches	O
in	O
inappropriate	O
locations	O
,	O
such	O
as	O
electrical	O
boxes	O
,	O
which	O
may	O
encourage	O
risky	O
behavior	O
,	O
especially	O
by	O
children	O
.	O
</s>
<s>
For	O
example	O
,	O
in	O
Virginia	O
,	O
Groundspeak	B-Application
's	O
Wiki	O
for	O
Virginia	O
's	O
land	O
management	O
policies	O
,	O
retrieved	O
January	O
12	O
,	O
2013	O
the	O
Virginia	O
Department	O
of	O
Transportation	O
and	O
the	O
Wildlife	O
Management	O
Agency	O
now	O
forbids	O
the	O
placement	O
of	O
geocaches	O
on	O
all	O
land	O
controlled	O
by	O
those	O
agencies	O
.	O
</s>
<s>
The	O
South	O
Carolina	O
House	O
of	O
Representatives	O
passed	O
Bill	O
37772005	O
–	O
2006	O
Bill	O
3777	O
:	O
Geocache	O
,	O
geocaching	B-Application
,	O
and	O
letterboxing	B-Operating_System
South	O
Carolina	O
Legislature	O
Online	O
in	O
2005	O
,	O
stating	O
,	O
"	O
It	O
is	O
unlawful	O
for	O
a	O
person	O
to	O
engage	O
in	O
the	O
activity	O
of	O
geocaching	B-Application
or	O
letterboxing	B-Operating_System
in	O
a	O
cemetery	O
or	O
in	O
a	O
historic	O
or	O
archaeological	O
site	O
or	O
property	O
publicly	O
identified	O
by	O
a	O
historical	O
marker	O
without	O
the	O
express	O
written	O
consent	O
of	O
the	O
owner	O
or	O
entity	O
which	O
oversees	O
that	O
cemetery	O
site	O
or	O
property.	O
"	O
</s>
<s>
The	O
Illinois	O
Department	O
of	O
Natural	O
Resources	O
requires	O
geocachers	B-Application
who	O
wish	O
to	O
place	O
a	O
geocache	O
at	O
any	O
Illinois	O
state	O
park	O
to	O
submit	O
the	O
location	O
on	O
a	O
USGS	O
7.5	O
minute	O
topographical	O
map	O
,	O
the	O
name	O
and	O
contact	O
information	O
of	O
the	O
person(s )	O
wishing	O
to	O
place	O
the	O
geocache	O
,	O
a	O
list	O
of	O
the	O
original	O
items	O
to	O
be	O
included	O
in	O
the	O
geocache	O
,	O
and	O
a	O
picture	O
of	O
the	O
container	O
that	O
is	O
to	O
be	O
placed	O
.	O
</s>
<s>
In	O
April	O
2020	O
,	O
during	O
the	O
COVID-19	O
pandemic	O
,	O
the	O
township	O
of	O
Highlands	O
East	O
,	O
Ontario	B-Architecture
,	O
Canada	O
temporarily	O
banned	O
geocaching	B-Application
,	O
over	O
concerns	O
that	O
geocache	O
containers	O
cannot	O
be	O
properly	O
disinfected	B-Application
between	O
finds	O
.	O
</s>
<s>
thumb|A	O
79-year-old	O
man	O
fell	O
off	O
a	O
cliff	O
in	O
Dishman	O
Hills	O
,	O
Washington	O
,	O
while	O
geocaching	B-Application
in	O
2009	O
.	O
</s>
<s>
"	O
Valley	O
man	O
geocaching	B-Application
in	O
Dishman	O
Hills	O
before	O
fatal	O
fall	O
"	O
-	O
YouTube	O
.	O
</s>
<s>
The	O
death	O
of	O
a	O
21-year-old	O
experienced	O
cacher	O
in	O
December	O
2011	O
"	O
while	O
attempting	O
a	O
Groundspeak	B-Application
cache	O
that	O
does	O
not	O
look	O
all	O
that	O
dangerous	O
"	O
led	O
to	O
discussions	O
of	O
whether	O
changes	O
should	O
be	O
made	O
,	O
and	O
whether	O
cache	O
owners	O
or	O
Groundspeak	B-Application
could	O
be	O
held	O
liable	O
.	O
</s>
<s>
Groundspeak	B-Application
has	O
since	O
updated	O
their	O
geocaching.com	O
terms	O
of	O
use	O
agreement	O
to	O
specify	O
that	O
geocachers	B-Application
find	O
geocaches	O
at	O
their	O
own	O
risk	O
.	O
</s>
<s>
Three	O
adult	O
geocachers	B-Application
,	O
a	O
24-year-old	O
woman	O
and	O
her	O
parents	O
,	O
were	O
trapped	O
in	O
a	O
cave	O
and	O
rescued	O
by	O
firefighters	O
in	O
Rochester	O
,	O
New	O
York	O
,	O
U.S.	O
while	O
searching	O
for	O
a	O
geocache	O
in	O
2012	O
.	O
</s>
<s>
In	O
2015	O
,	O
Her	O
Majesty	O
's	O
Coastguard	O
were	O
called	O
to	O
a	O
group	O
of	O
geocachers	B-Application
who	O
were	O
spotted	O
walking	O
into	O
the	O
Severn	O
Estuary	O
off	O
the	O
coast	O
of	O
Clevedon	O
,	O
England	O
,	O
in	O
search	O
of	O
clues	O
to	O
locate	O
a	O
multi-cache	O
.	O
</s>
<s>
In	O
October	O
2016	O
,	O
four	O
people	O
discovered	O
a	O
crashed	O
car	O
at	O
the	O
bottom	O
of	O
a	O
ravine	O
in	O
Benton	O
,	O
Washington	O
,	O
U.S.	O
,	O
while	O
out	O
geocaching	B-Application
.	O
</s>
<s>
Two	O
of	O
the	O
geocachers	B-Application
died	O
,	O
while	O
two	O
others	O
were	O
rescued	O
from	O
the	O
river	O
.	O
</s>
<s>
Geocaching	B-Application
websites	O
vary	O
in	O
many	O
ways	O
,	O
including	O
control	O
of	O
data	O
.	O
</s>
<s>
On	O
September	O
2	O
,	O
2000	O
,	O
Jeremy	O
Irish	O
emailed	O
the	O
gpsstash	O
mailing	O
list	O
that	O
he	O
had	O
registered	O
the	O
domain	O
name	O
geocaching.com	O
and	O
had	O
set	O
up	O
his	O
own	O
Web	O
site	O
.	O
</s>
<s>
The	O
largest	O
site	O
is	O
Geocaching.com,	O
owned	O
by	O
Groundspeak	B-Application
Inc.	O
,	O
which	O
began	O
operating	O
in	O
late	O
2000	O
.	O
</s>
<s>
Free	O
membership	O
allows	O
users	O
access	O
to	O
coordinates	O
,	O
descriptions	O
,	O
and	O
logs	O
for	O
some	O
caches	O
;	O
for	O
a	O
fee	O
,	O
users	O
are	O
allowed	O
additional	O
search	O
tools	O
,	O
the	O
ability	O
to	O
download	O
large	O
amounts	O
of	O
cache	O
information	O
onto	O
their	O
gps	O
at	O
once	O
,	O
instant	O
email	O
notifications	O
about	O
new	O
caches	O
,	O
and	O
access	O
to	O
premium-member-only	O
com	O
's	O
Premium	O
Membership	O
Benefits	O
Retrieved	O
June	O
25	O
,	O
2013	O
.	O
</s>
<s>
Geocaching	B-Application
Headquarters	O
are	O
located	O
in	O
the	O
Fremont	O
neighborhood	O
of	O
Seattle	O
,	O
Washington	O
,	O
United	O
States	O
.	O
</s>
<s>
The	O
Opencaching	O
Network	O
lists	O
the	O
most	O
types	O
of	O
caches	O
,	O
including	O
traditional	O
,	O
virtual	O
,	O
moving	O
,	O
multi	O
,	O
quiz	O
,	O
webcam	B-Protocol
,	O
BIT	O
,	O
guest	O
book	O
,	O
USB	O
,	O
event	O
,	O
and	O
MP3	O
.	O
</s>
<s>
Each	O
Opencaching	O
Node	O
provides	O
the	O
same	O
API	B-General_Concept
for	O
free	O
(	O
called	O
"	O
OKAPI	O
"	O
)	O
for	O
use	O
by	O
developers	O
who	O
want	O
to	O
create	O
third-party	O
applications	O
which	O
can	O
use	O
the	O
Opencaching	O
Network	O
's	O
content	O
.	O
</s>
<s>
Generally	O
,	O
most	O
geocaching	B-Application
services	O
or	O
websites	O
offer	O
some	O
basic	O
information	O
for	O
free	O
,	O
but	O
users	O
may	O
have	O
to	O
pay	O
for	O
premium	O
membership	O
that	O
allows	O
access	O
to	O
more	O
information	O
or	O
advanced	O
searching	O
capabilities	O
.	O
</s>
<s>
In	O
many	O
countries	O
there	O
are	O
regional	O
geocaching	B-Application
sites	O
,	O
but	O
these	O
mostly	O
only	O
compile	O
lists	O
of	O
caches	O
in	O
the	O
area	O
from	O
the	O
three	O
main	O
sites	O
.	O
</s>
<s>
in	O
the	O
former	O
Soviet	O
Union	O
,	O
the	O
site	O
Geocaching.su	O
remains	O
popular	O
because	O
it	O
accepts	O
listings	O
in	O
the	O
Cyrillic	O
script	O
.	O
</s>
<s>
Additional	O
international	O
sites	O
include	O
Geocaching.de,	O
a	O
German	O
website	O
,	O
and	O
Geocaching	B-Application
Australia	O
,	O
which	O
accepts	O
listings	O
of	O
cache	O
types	O
deprecated	O
by	O
geocaching.com,	O
cache	O
types	O
such	O
as	O
TrigPoint	O
and	O
Moveable	O
caches	O
,	O
as	O
well	O
as	O
traditional	O
geocache	O
types	O
.	O
</s>
<s>
In	O
2012	O
it	O
was	O
announced	O
that	O
Navicache	O
was	O
under	O
transition	O
to	O
new	O
owners	O
,	O
who	O
said	O
they	O
"	O
plan	O
to	O
develop	O
a	O
site	O
that	O
geocachers	B-Application
want	O
,	O
with	O
rules	O
that	O
geocachers	B-Application
think	O
are	O
suitable	O
.	O
</s>
<s>
Geocaching.com	O
and	O
OX	O
are	O
both	O
backed	O
by	O
large	O
enterprises	O
,	O
and	O
while	O
that	O
means	O
they	O
have	O
more	O
funding	O
and	O
people	O
,	O
we	O
're	O
a	O
much	O
smaller	O
team	O
–	O
so	O
our	O
advantage	O
is	O
the	O
ability	O
to	O
be	O
dynamic	O
and	O
listen	O
to	O
the	O
users.	O
"	O
.	O
</s>
<s>
For	O
extreme	O
caching	O
all	O
you	O
need	O
is	O
an	O
extreme	O
caching	O
account	O
and	O
a	O
GPS	O
device	O
with	O
coordinates	O
or	O
a	O
GPS-enabled	O
smartphone	O
with	O
geocaching	B-Application
or	O
outdoor	O
navigation	O
software	O
,	O
e.g.	O
</s>
<s>
Geocaching	B-Application
Australia	O
is	O
a	O
community	O
website	O
for	O
geocachers	B-Application
in	O
Australia	O
and	O
New	O
Zealand	O
.	O
</s>
<s>
Geocaching	B-Application
Australia	O
also	O
has	O
many	O
unique	O
cache	O
types	O
such	O
as	O
Burke	O
And	O
Wills	O
,	O
Moveable_cache	O
&	O
Podcache	O
geocaches	O
.	O
</s>
