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Garmin GPS III Plus date problem
It's now February 2019 and the advice in this thread worked perfectly to fix my incorrect date showing up on my 20 year old GPS Pilot III. Fortunately I still had the serial cable (with USB adapter) to connect my unit to my PC and the linked GPSeow app worked great to update everything.
Fingers crossed that everything still works after the next epoch rollover coming this April!
edited February 26
Big thank you to
. Your solution worked great on my GPS III Plus on Feb-25-2019. As previously noted you MUST NOT have any satellites connected at the time you send the signal, or it will not work.