Colonel Panic wrote:My beloved Garmin Pilot III is showing "10:46:28 LCL, and 23-AUG-99" - the time is correct (UTC) but presumably it has not rolled over re: date. Does anyone know if this can be remedied?
I don't have a GPS III to test this on, but one of the discussion groups I monitor for timing experts recently had the following post:
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/gnbaddele ... ftware.zip
I have no way of validating the software linked to, so please be careful, but it might just be useful.
Another post in the same group noted that the clock is actually 1024 weeks and 4 seconds out due to the leap seconds which have occurred between August 1999 (the last rollover) and today. Again, I have no way to validate this claim, and I believe there have been five leap seconds hence there is some doubt as to the validity of the claim.