<s>
OpenCPN	B-Application
(	O
Open	O
Chart	O
Plotter	O
Navigator	O
)	O
is	O
a	O
free	B-Application
software	I-Application
maritime	O
chart	O
plotter	O
and	O
navigation	O
software	O
for	O
use	O
underway	O
or	O
as	O
a	O
planning	O
tool	O
.	O
</s>
<s>
By	O
using	O
satellite	O
navigation	O
and	O
other	O
NMEA	B-Protocol
0183	I-Protocol
data	O
feeds	O
,	O
OpenCPN	B-Application
determines	O
a	O
ship	O
's	O
own	O
position	O
and	O
status	O
from	O
sensors	O
such	O
as	O
AIS	O
receivers	O
to	O
automatically	O
plot	O
and	O
track	O
the	O
positions	O
of	O
ships	O
in	O
the	O
neighborhood	O
.	O
</s>
<s>
In	O
2017	O
Norwegian	O
ENC	B-Application
charts	O
were	O
available	O
for	O
OpenCPN	B-Application
.	O
</s>
