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I used an inexpensive (2 gallon?) ziploc bag around my iPad on a day when I had the roof off my Jeep and we got several inches of rain.

Worked fine, even Touch ID was mostly usable, but I can't imagine what an unlaminated map would have looked like at the end of that storm.




There are maps on woven cotton. If the ink is waterproof, they work underwater. They aren't quite as thin though, at the same strength, due to the somewhat too regular bonding of the fibers (woven bundles vs. one big flat bundle).




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