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The 305 manual says that it is waterproof for something like "30 ft underwater for 20 min" or so, and I imagine the 705 would be the same.
 

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trail rat
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GPS Magazine Hands On Review

The entire Edge 705 casing is sealed to protect the unit from the elements (the Edge 705 is waterproof rated to IPX-7 standards, meaning it can be completely submerged in water for up to 30 minutes).
This also has many excellent screen shots!
 

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since 4/10/2009
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I would suggest if you push those waterproofness limits, you pull the batteries out and dry it off. My 76CSx (same waterproofness rating) got thrashed in a river for awhile before we got it (and the canoe it was lashed to) unpinned from the rock. It still worked, but water got inside. By the time I got home, it did not work. So I removed the batteries and trained a hairdryer on it...and then let it sit about 24hrs before reinstalling the batteries. It fired back up then, but it definitely had me worried.
 

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trail rat
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NateHawk said:
I would suggest if you push those waterproofness limits, you pull the batteries out and dry it off. My 76CSx (same waterproofness rating) got thrashed in a river for awhile before we got it (and the canoe it was lashed to) unpinned from the rock. It still worked, but water got inside. By the time I got home, it did not work. So I removed the batteries and trained a hairdryer on it...and then let it sit about 24hrs before reinstalling the batteries. It fired back up then, but it definitely had me worried.
You can flood it with rubbing alcohol to soak up the water too, will not hurt the electronics. Just dry it will before turning it on.

The 705 is sealed battery, so you cannot remove it easily.
 

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since 4/10/2009
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The battery compartment on mine is supposedly sealed, too...but plenty of water still got in. This was no simple dunking, either, but a straight thrashing. Still, important to check IMO, anytime the GPS gets wet from more than a rain shower.
 
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