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I live in Sweden and I hike a lot in the wild. My personal top three properties to look for in a handheld GPS receiver for The Great Outdoors: Battery life Battery life Battery life I honestly don't care if the measurement is 20 metre off. In the Swedish mountains, it usually isn't, there are no deep canyons, and if there are you can only go in one ...

If you really do need exceptional accuracy, you could use the solution many Ingress players use - a good Android phone with a battery pack. In the game you often need accuracy of 2 or 3 metres - so the Galaxy S3 or a phone paired with the Nexus 7 (which has an excellend GPS) are the tools of choice. The game uses google maps and wireless navigation, as well ...

Below are some resources for US vector data. The links do provide gdb format downloads that will drop into a garmin for example. The format that you are looking for is a shapefile though. Those are the most standardized format for vector data sets but are very clumsy to work with. http://fsgeodata.fs.fed.us/vector/index.php ...

I probably wouldn't use regular epoxy. I have had trouble with it on rubber around water. When I am trying to reseal rubber I use silicone sealant or seal cement or Super under water epoxy. The seal cement is neoprene but it dries waterproof. Any one should work just fine it only depends on what you use the GPS for. Obviously the 3000 PSI rated epoxy ...