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That may not sound like much, but it’s enough to tell your loved ones where you are (or that you’re delayed), receive medical advice, and even download an up-to-date weather report.

We’re talking around 140 characters, like in the early days of SMS messaging. Instead, they hook into the world’s Global Positioning System (GPS) satellite network to locate your position, and another network of satellites to send and receive messages. Unlike the phone you use every day, GPS communicators don’t require a cell signal to work. Thankfully, there is a family of gadgets to help you abide by all of those rules. 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.