<s>
In	O
navigational	O
instruments	O
,	O
a	O
plotter	B-Operating_System
is	O
an	O
instrument	O
which	O
marks	O
the	O
position	O
of	O
a	O
vehicle	O
on	O
a	O
map	O
or	O
chart	O
.	O
</s>
<s>
Several	O
types	O
of	O
plotters	B-Operating_System
exist	O
.	O
</s>
<s>
These	O
include	O
manual	O
and	O
electronic	O
plotters	B-Operating_System
:	O
</s>
