I'm on the fence about which series to buy, however, Black Friday deals seem to be having the series one version on sale which makes it more appealing. I like Series 2 because its newer, however, the GPS doesn't matter much to me. The big concern is how 'splashproof' is series 1. I realize it can't go in the pool, but how about if I were walking outside, and it starts pouring rain? Do I need to take it off? or will it withstand that sort of scenario?