I just want to confirm that the procedure described here to reset the MMSI works perfectly on the GX1260S.
To clarify the language of the procedure a little, kill the power first, then open the little panel on the back (3 screws). The orientation of the blue jumper on my unit was up and down, relative to the unit itself, on the right side of the 4-pin jumper block as you face the back of the radio. So you turn the jumper 90 degrees and insert it on the bottom 2 pins. Hold CALL/SET button down as you power up the unit. The MMSI user setting in the menu is clear.
I may be the last person in the world who owns one that still works, but I wanted to either sell or gift this unit which is still working very well. Sadly, my 3rd CM21 RAM mic failed (just the microphone, not the speaker or anything else) and I was unable to score a replacement anywhere.
So after 21 years, I've upgraded to a GX1800G and added a RAM4+. I notice that on my old
Cheoy Lee 38, the
GPS works fine without the optional external
antenna, so I won't need to pick up my LAT/LONG from from my Vesper XB8000
AIS via
NMEA 0183 for the new GX1800G, as I did on the old Intrepid.