I've also used the bezel as an azimuthal measurement, referring to a plumb line to establish the horizontal/vertical orientation.

You can also use it to keep track of other angular measures instead of having to write them down, such as last bearing to target etc.

I am sure there are various other uses as well.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)