You are reading a single comment by @Ordinata and its replies.
Click here to read the full conversation.
-
'As for the "Units Per Hour" markings on the bezel, those indicate miles per hour, as measured over a distance of one mile. The best I can describe this is to say that if you were driving along a highway in an automobile, and activated the chronograph as you passed a mile marker, if you stopped the chronograph immediately as you passed the next mile marker, the number indicated by the second hand on the bezel would be your average speed in "miles per hour" over that distance. There's probably a way to use this in an airplane as well, but I'm not a pilot, and don't know how that would work.'
Ordinata
deleted
That's an odd tachymeter scale, any more info on it?