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In my opinion, the single best feature would be low battery consumption. You only really need a gps and map, so having a low consumption version of these would win for me, possibly with local maps ...
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#1: Attribution notice removed
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System
·
2020-05-27T11:08:38Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/1402 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/