It’s not perfect. As with any GPS receiver, you need a clear shot at those satellites. The Messenger can have a hard time finding itself under heavy tree cover or in a narrow, rocky ravine. Power comes from three AAA Energizer Ultimate Lithium batteries, which should last about three months, though we like to carry an extra set just in case. Even if you never send for help, just knowing you could is worth far more than the initial investment. SPOT offers various alternatives, including the Connect, which lets a Smartphone talk to communication satellites when you’re riding off the grid. We like the Messenger for motorcycle use. On a solo reconnoiter to the middle of nowhere, it means one less thing to worry about. And that, as they say, is priceless.