Smartphones are very handy when it comes to navigation, but there are still other advantages from handheld GPS units that you just don't get with your trusty all-out device.
Durability Handheld GPS units are built for back-country use, so they are usually waterproof. If you're out camping, you don't have to worry about them getting soaked in the rain or even in the stream. Battery life If you've ever turned GeoLocation on for your SnapChat or PokemeonGo, you know how fast phone batteries die. A handheld GPS, on the other hand, runs on about 15 hours or more per charge, making it a far better device to be used in the woods than your smartphone. Coverage GPS units should accurately pinpoint your location as it detects your device from a certain point in the sky. Others are strong enough to work even under dense tree covers, so handheld devices are stronger as they don't rely on your cellphone provider's coverage area. Features Handheld units are equipped with barometers to help you track changing weather conditions. They usually have electronic compass as well to help with directions and an altimeter or barometer to find where you are on a vertical plane—or above sea level. There are also units that allow you to exchange coordinates wirelessly, trial routes, and even track geocaches, sometimes even connect to computers, heart rate monitors, and other ANT-Enabled devices like the ones you see in fitness devices like smartwatches. Mapping GPS units don't require cellphone data connection to download mapping, so it is always available. Many GPS units, however, support a variety of options including topographic, road, and waterway mapping—even satellite imagery. More detailed mapping usually needs to be bought separately, but most of them have to pay for a one-time cost.
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