Fireboomer:
Like Mmartin said, water within the battery compartment of the III, III+, or StreetPilot III is not a serious problem. I have had a SP III on my moto for 2 years and 70,000 km, it's been wet in the battery compartment occasionally, but that has not caused any problems.
We get water in the battery compartment when the units are mounted on motorcycles with the battery compartment facing forward, and we then ride in rain.
I suggest you just bring the unit inside occasionally and take the battery cover off, and let the unit dry out. The contacts for the batteries on the GPSR itself won't rust, they are stainless steel. Your batteries might rust, just visually inspect them and replace them if needed.
I don't recommend you try to seal the battery compartment up further with silicone or anything like that. Not only is it not needed, but it will prevent the battery compartment from naturally drying out on sunny days, which is what happens now. You probably just looked at your unit a day or two after riding in the rain or washing your bike, and found it wet then.
PanEuropean
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