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Oh don't get me wrong, I'm sure there are a ton of people out there who buy it purely for the looks and have never used it regardless of whether or not they know how to.
(Though I still maintain a tachymeter is a lot less useful yet is never questioned why it's on a watch)
Though if you want to go all out on your fancy scales around the circumference, you have to go with a telemeter. To judge the distance of something given the difference in time between seeing it and hearing it:
mmccarthy
pdlouche
Fair point; I should perhaps have said 'mainly know how to use it in theory' (because you've got an E-6B in the flight bag, haven't used that in a decade, and played with the watch a few times after you bought it...)