Originally Posted by MarkofSeaLife
The radar needs the Lowrance plotter, which the OP has, so a cheaper AIS transponder will come in under the $2,000.
GPS transponders $2,000.-? More like $500.-. Eg
Si-Tex MDA 1 Metadata Class B AIS Transceiver The GPS Store
Even West Marine has them for 600.- rack rate, e.g. the EM TRAK MARINE ELECTRONICS B100
Of course they are all Class B but that's what you want.