Is it easy to change a Raystar 120 fitted in 2003 for a 125.The price is very high for a stand alone antenna.Thanks
Problems with fit out were being ignorant of the fact that the 125 was an active GPS aerial, not passive as the 120, which caused me much confusion with the "old" GPS still configured. I configured the 125 for Seatalk and linked into the Course Computer, NMEA is an alternative from the 125 but then you will need a power source. Having disconnected the "old" GPS then managed to get a fix on the chartplotter and has been excellent ever since, however the "old" GPS also fed NMEA to the Navtex and DCS Radio. I then had to find an alternative NMEA feed for these devices.
So not quite as simple replacement as first thought, depends upon your instrument configuration but there may be other issues to resolve!
The 120 has a simple co-ax, the 125 will be multi-core, not sure from memory how many wires but are colour coded for configuration of either Seatalk or NMEA connections. The latest 125 has a small light on the top surface which when active displays a different light to signify searching, fix, and I think Seatalk or NMEA, don't have the unit or instruction to hand so not sure, Raymaine website product info should give you this I would think.
Stand corrected then, not sure what my original Raytheon mushroom shaped, passive looks like a 120 was. Apologies to OP.