Seems there is practically
no waterproofing of the touch screen.
I finally ran into trouble with my GW-52. Despite double-bagging, a few drops of water got onto the device. The touch screen became unresponsive. When I plugged it in as usual to download the data (using VMWare on the Mac), I ended up with a corrupted file where all points after the first couple of runs were invalid.
Downloading the data on a Windows computer worked and gave file with the entire tracks (including the drive home). But after disconnecting the GW-52, it kept beeping, and the screen would flash and change what it showed. That stopped after 5 or 10 minutes, but then the "Mode" touch screen key wa sunresponsive. All other touch screen keys worked, prompting me to unlock the device by pressing "Mode" and "Start" - funny!
After storing the GW-52 on it's side to a few minutes, the "Mode" button started working again. I then took a close look at the touch screen, and noticed a small (3-4 mm wide) darker area on the edge of the touch screen, just above the "L" in the image:
Looks like a bit of water got in there, which creates some problems with the touch screen electronics. Why they call it "Waterproof" on the Locosys web site is beyond me. Even the GP-102 is more waterproof than that (and the GP-102 "waterproofing" stinks).