![]() You can manage all your maps and plan trips by connecting to your PC or Mac, then using the program that the maker of your GPS unit provides. ![]() Most units also accept separately purchased topo maps that are downloaded or provided on a CD or a microSD card. Some units also include full-fledged topo maps. Preloaded maps: All GPS units come with a simple base map. It provides a quick and easy way to share data like tracks, waypoints and routes with others. Wireless data transfer: This allows your GPS to communicate with compatible (same-brand) GPS units. That’s a big convenience as it lets you orient yourself and plan your route at any rest stop. If you get a unit with an electronic compass, though, it will also tell you what direction you’re facing while you’re standing still. This feature also lets you gauge weather trends.Įlectronic compass: All GPS receivers can tell you what direction you’re going while you’re moving. Barometer/altimeter: While all GPS receivers can tell you altitude based on satellite data, a unit with the barometer/altimeter feature provides more accurate elevation readings by also considering barometric data.
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