I am curious, does someone really do that somewhere?
Don't get me wrong, I have a moonphase I am all for useless stuff , but who, knowing 2 points in space a km from one another, measures speed of its vehicule (min. is 60km/h, it can't be anything else right?) by looking at its second hand on his watch?
Who does that, seriously?
I think it also work in reverse as you hinted, if you know your speed, you could technically calculate the distance between 2 points the same way. Again, why would you do that?
Too much of a stretch for me, I don't believe it can actually happen, but please, prove me wrong!
I'm with Mr. Sushiman here. I'm pretty sure I'll never use the tachymeter bezel for its purpose.
That said, I love the slide rule bezel on classic Navitimers.