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Shock-Proof your Garmin GPS

Step 2What is the problem with the GPS?

Why is the unit losing power under severe vibration? Somehow an open-circuit is briefly created in the power for the unit. This can happen in a couple of ways - a soldered electrical contact can vibrate until it breaks, or a pressure-fit electrical contact can vibrate enough that it momentarily opens. I've seen many forms of these failures over the years in car stereos, portable radios, and other devices that get bounced around a lot. You never know what happened until you open them up.

The most obvious thing that might be happening is the batteries might be vibrating in the battery holder. This was the problem in my old Etrex GPS, and I was able to fix it by stuffing foam into the battery holder. I tried that trick first with the 76cs when it started acting up, but it didn't help so I concluded the problem was internal.

Lets open it up and see what's going on!
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Author:dan(MonkeyLectric)
Dan Goldwater is a co-founder of Instructables. Currently he operates MonkeyLectric where he develops revolutionary bike lighting products. He also writes a DIY column for Momentum magazine.