For years I've used a Spot Gen 3 GPS unit on solo treks and group trips in the backcountry, and set tracking to ping about every 10 or so minutes. I believe you can even narrow it down to shorter time intervals. Afterwards, in looking at either a topo map or even just cross-checking with pictures I've taken the accuracy using Spot's own online/app mapping interface works pretty well to track an adventure. Hope this helps!
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