And before you ask, no you can't do it yourself - that software is
proprietary to Garmin.

I asked in a different post ... oh well -- I'll try getting it -- yesterday it
went out when I absolutely needed it...

They aren't delicate, but anything from temp to defect in the crystal
can cause it. Most likely, it's a defect in the crystal. And your
symptoms are very typical.

well; then that's good that it's typical -- bummer is I gotta haul the boat out
to change it...


That doesn't mean it can't be something else. I assume you've checked
wiring connections, etc.

1st thing I checked.

In my experience, they have never had good customer service.

Ever.

when my 12xl had an issue -- they sent me a ups call tag for overnight shipping
& then shipped it back -- it was 4 days from time it was sent to the time I got
it back.... it was out of warranty but they fixed it for free... that was 10+
years ago tho. I was able to reflash the 12xl -- which is why I hoped I could
update the stuff on my 498...

I'll order up a new transducer & try to get the unit reflashed...