I figured it out.
The scale changes with the addon U-boat missions. With the standard game it measures in 1/10th of a mni/km per graduation. With the U-Boat addon it changes the scale under 10 nmi/km to yards/meters.
The 1/10th graduation is really kind of imprecise. On the nmi scale, that's 200 yards per graduation. That's equal to almost twice the length of an average transport during WW2.
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