But Garmin GPS12 (not XL) with 4.58 seems to fail! It shows 22 Aug 99,
also with about one second time error. Otherwise the navigation was OK
at least with quick test.

--
73s!
Esa
OH4KJU

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.

The only thought I had was that the GPS 12 (still working, still showing
"19" as the year) was bought new around 2002 with a differential
receiver. Perhaps there was something different for that?

John

On 7/4/19 6:42 pm, John wrote:

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:

Amazing! Now my GPS12 shows correct date again! Time is still not
exactly synced, but inside same second. Maybe it's display issue; too
slow rerfresh rate for accurate seconds.

My GPS12 was unused many years and had lost all settings. Last time I
used it in geocaching because it seems to perform better than smartphone
GPS in some difficult places like in forest.

--
73s!
Esa
OH4KJU