thanks for that, it looks like the large picture i posted is in fact the U-boat commander version, not the flieger version, despite the label.
in the link you provided the flieger version clearly does not include Telemeter and tachymeter markings in red
so..now..who can explain to me how to use the telemeter and tachymeter scales
i already answered my other question which is that the red mark at the top is a rotating bug, which presumably is used in conjunction with the telemeter
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill
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