Offtrack, in the HEMA maps, I thought that purple meant that it had been driven and GPS mapped, and that red meant that is was gleaned from gov't or other topographic sources.
This is borne out by your map - the purple is following the gps log, the red is a broad line as you would get from a sat pic or similar through tree cover and a human hand drawing the map.


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The map datum is critical.
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