TorpX has the correct answer. I forgot about that Torp. I have seen my mileage go way up and way down depending on when I clicked it simply due to the lag from time of speed change to actually being at that speed.
Ahead 1/3 click range at current speed, then hit Flank and instantly hit range at current speed again .... now time compress for an elapsed ten minutes and check it again and it will not be the same.
In your photo your going against a current in one direction and with it in another so do two comparison photos but be in the same exact location and both in the same exact direction for a more accurate reading. Science duplicate experiments exactly and watches the results. If you have variables that are not the same in each experiment you'll never get accurate information.
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