I have been given a Comar USB dual-channel AIS
by someone who has upgraded to a transponder. It is in "full working order" apparently.
I've configured OpenCPN
to see the AIS
and Class A targets are displayed but Class B targets aren't showing up at all. Several Class B's were within line-of-sight and between 400 metres and a couple of kilometres away for 20-30+ minutes. They were transmitting according to Marine
Traffic Android app on a phone
(different receiving station, I know, but...)
Any ideas why OpenCPN
isn't picking up the Class B's? Is there a setting somewhere in OpenCPN I've missed?
Using Version 4.0.0 Build 2015-01-08.