The number one rule for off-the-grid adventures is “Come back alive.” That’s a very good rule, but there are other important ones, too, including “Don’t make your friends and family worry about you,” “Don’t get lost,” and other well-roasted chestnuts. Thankfully, there is a family of gadgets to help you abide by all of those rules.
Unlike the phone you use every day, GPS communicators don’t require a cell signal to work. Instead, they hook into the world’s Global Positioning System (GPS) satellite network.
