<s>
A	O
moving	B-Application
map	I-Application
display	I-Application
is	O
a	O
type	O
of	O
navigation	O
system	O
output	O
that	O
,	O
instead	O
of	O
numerically	O
displaying	O
the	O
current	O
geographical	O
coordinates	O
determined	O
by	O
the	O
navigation	O
unit	O
or	O
an	O
heading	O
and	O
distance	O
indication	O
of	O
a	O
certain	O
waypoint	O
,	O
displays	O
the	O
unit	O
's	O
current	O
location	O
at	O
the	O
center	O
of	O
a	O
map	O
.	O
</s>
<s>
Mechanical	O
moving	B-Application
map	I-Application
displays	I-Application
using	O
paper	O
charts	O
were	O
first	O
introduced	O
in	O
the	O
1950s	O
,	O
and	O
became	O
common	O
in	O
some	O
roles	O
during	O
the	O
1960s	O
.	O
</s>
<s>
Mechanically	O
moved	O
paper	O
maps	O
were	O
replaced	O
by	O
projected	O
map	O
displays	O
and	O
digital	O
maps	O
during	O
the	O
1970s	O
and	O
80s	O
,	O
with	O
resolution	O
and	O
detail	O
improving	O
along	O
with	O
computer	O
imagery	O
and	O
the	O
computer	B-General_Concept
memory	I-General_Concept
systems	O
that	O
held	O
the	O
data	O
.	O
</s>
<s>
Some	O
moving	B-Application
map	I-Application
display	I-Application
systems	O
also	O
provide	O
a	O
method	O
of	O
displaying	O
the	O
elevation	O
of	O
the	O
device	O
above	O
sea	O
level	O
or	O
the	O
earth	O
's	O
surface	O
.	O
</s>
<s>
A	O
common	O
example	O
of	O
a	O
moving	B-Application
map	I-Application
display	I-Application
today	O
is	O
the	O
map	O
display	O
on	O
a	O
smart	B-Application
phone	I-Application
or	O
tablet	B-Device
screen	O
,	O
with	O
an	O
app	B-Application
using	O
GPS	O
to	O
determine	O
the	O
device	O
's	O
current	O
position	O
and	O
display	O
it	O
on	O
map	O
data	O
from	O
the	O
device	O
's	O
internal	O
storage	O
or	O
from	O
the	O
Internet	O
in	O
real	O
time	O
.	O
</s>
<s>
This	O
use	O
of	O
phones	O
and	O
tablets	B-Device
has	O
expanded	O
very	O
rapidly	O
for	O
navigation	O
in	O
car	O
travel	O
,	O
hiking	O
,	O
and	O
aviation	O
.	O
</s>
<s>
Moving	O
map	O
applications	O
are	O
now	O
included	O
in	O
the	O
base	O
software	O
for	O
most	O
phones	O
and	O
tablets	B-Device
,	O
and	O
include	O
many	O
helpful	O
options	O
like	O
directions	O
to	O
destination	O
,	O
business	O
hours	O
,	O
and	O
more	O
.	O
</s>
