I dug out my old Garmin GPS-III's (mid 1990's vintage !). The internal backup batteries had completely died after many years of non-use, so it took a while for them to find the satellites, but when they did, they, of course, came up with an August 1999 date. A quick "Google" found that someone is hosting a zipped Windows executable (apparently originally from Garmin) that you run when the satnav is connected to your PC via a serial cable, and it corrects whatever internally so that the date is reported correctly. Works like an absolute charm! The program doesn't say it is specifically for the GPS-III, so it might be using a standard (undocumented, of course!) message that will work on a whole bunch of receivers. Might be worth giving it a try? See:
https://sites.google.com/site/gnbaddeley/GpsEow_V1.20_PC_Software.zip Regards, Peter On Mon, 8 Apr 2019 at 14:01, David J Taylor via time-nuts < time-nuts@lists.febo.com> wrote: > I checked today the GPS12XL I have, and that came up with a date in > August 99, before dying a few minutes later. Firmware 4.57. > [] > John > ================================ > > John, > > I think my 12XL firmware 4.60 is OK. Perhaps you can update the firmware? > > Cheers, > David > -- > SatSignal Software - Quality software for you > Web: http://www.satsignal.eu > Email: david-tay...@blueyonder.co.uk > Twitter: @gm8arv > > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.