<s>
At-location	B-Application
mapping	I-Application
(	O
ALM	O
)	O
is	O
closely	O
related	O
to	O
location-based	B-Application
services	I-Application
(	O
LBS	O
)	O
.	O
</s>
<s>
At-location	B-Application
mapping	I-Application
devices	O
,	O
like	O
personal	B-Application
digital	I-Application
assistants	I-Application
(	O
PDAs	B-Application
)	O
or	O
cellular	O
telephones	O
,	O
deliver	O
maps	O
on	O
small	O
screens	O
that	O
can	O
be	O
used	O
for	O
navigation	O
or	O
wayfinding	O
.	O
</s>
<s>
The	O
attributes	O
of	O
these	O
maps	O
are	O
that	O
they	O
are	O
small	O
,	O
perhaps	O
only	O
100×100	O
pixels	B-Algorithm
and	O
they	O
must	O
work	O
adequately	O
on	O
small	O
colour	O
screens	O
.	O
</s>
