These days dedicated GPS devices are a bit of an outdated concept, with turn-by-turn directions, maps apps, and more as features on just about every smartphone available. But when it comes to exploring off the beaten path, relying on the maps on your smartphone (and its somewhat limited battery life) can be a scary concept. With the TopoCharger you get the latest topographical maps, and a built-in battery charger for a device you're already used to carrying everywhere. It doubles your battery life, while still working off the grid, thanks to your phone's own GPS capability. And with a powerful included app, you can set waypoints, take photos, save routes, and much more.

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