Speaking from many hours of frustration, in the end I gave up on an off brand AIS that was cheaper but after a couple of months of use would no longer communicate with my chartplotter
. I spent a lot of time on the phone and internet
, not to mention the efforts on my own.
The off brand AIS vendor represented pre-purchase that the interface was "no problem." Only after threatening legal
action did it refund a portion of the money
. Never again.
Go with the AIS sold
by the chart plotter manufacturer, particularly if it is NEMA 183, and even if it is is NEMA 2000. Per one technician, Raymarine reputedly uses a different set of NEMA 2000 connectors.