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"Though purists may say nothing can replace a printed topographic map, the world's leading smartphone apps are getting close. Technology is making it easier than ever to get lost in an adventure without getting lost in the wilderness, and there are plenty of ways to enjoy these benefits even when you've ventured to signal-free zones. Try one of these useful off-line apps on your next remote mountain trek, camping trip, or deep-sea dive to stay connected and informed without an internet connection."

""FireChat" sounds like a phony location-based sex line. It's not, it's a messaging app for iOS. We already have Whatsapp, Facebook messenger, Snapchat etc, what makes FireChat different? You can chat "off the grid", even if there is no internet connection or mobile phone coverage. How is that possible? Instead of relying on a central server, it is based on peer-to-peer "mesh networking" and connects to nearby phones using Bluetooth and WiFi, with connectivity increasing as more people use it in an area."