Electronic compasses are still evolving. I've got a Timex wristwatch with an electronic compass. It's still running the original batteries, but I need to calibrate the compass almost every time I use it.
I learned early-on that the Etrex units need to be calibrated after a battery change so I calibrate mine every so often just for the hell of it. It's too easy to calibrate it so I do it every time I need an accurate fix; which isn't too often to be much trouble.
What REALLY concerns me about your message is that the software started screwing up on you as the batteries ran low. That's a MAJOR red-flag to me. Batteries should only render the unit non functional from a power standpoint. Once you put new or freshly recharged batteries in everything should be fine; you shouldn't have to update the software. I'd be scared of that particular unit if my life depended on it. You have the Etrex Vista HCx, right?
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