MA800 GPS Antenna for AIS Transponders The MA800 passive GPS Antenna for AIS transponder (P/No. X500.391) is compatible with all current Digital Yacht AIS Transponders (AIT2000/2500/3000/5000/CLA1000/CLA2000). It is therefore an ideal replacement antenna for many makes of GPS receivers and chart plotters.  You can also use it with the discontinued AIT250 and AIT1000. However, the [...]