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Reduce GPX coordinate precision to 6 decimal places (remove nanometer-level noise) #706

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@jamescr

Following the discussion in #563, there is a strong consensus that OSMTracker currently saves GPS coordinates with excessive precision, which implies molecular/nanometer accuracy that consumer GPS hardware simply cannot deliver.

According to the OSM Wiki on Precision of Coordinates: 6 decimal places is more than enough for the best consumer GPS.

The proposed change is to round latitude and longitude to 6 decimal places when saving track points and update GPX export.


PD: XKCD: What your GPS doesn't tell you

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