In almost all cases, gear
designed to NMEA
0183 will work fine with previous versions of the protocol. But, there is a chance that some of the data coming from the B&G equipment
may not be decoded by the chartplotter
. I used to have an older Raymarine chartplotter
that didn't understand the wind
data from my B&G instruments. This had nothing to do with the NMEA version, but instead that there are multiple NMEA sentence types for the same data, and Raymarine
had chosen not to decode some of them.
I don't know if your Garmin
does a more complete job of decoding the various messages, but the spec sheets
for your gear
probably list the messages sent and decoded.