A telemeter scale is much rarer than a tachymeter, but one I personally like to use in the wild a lot more often. A telemeter enables you to just your distance from an event or phenomenon that is both visible and audible. The most common example here would be the centre of a lightning storm.
How does it work? On many occasions I have been out walking in the hills when bad weather has hit. In order to gauge whether a storm is moving away from or towards you, a telemeter can be very useful. When you see the flash of lightning, you start the chronograph hand ticking. When you hear the rumble of thunder, you stop it dead. The chronograph hand will be pointing at your distance from the storm (in either miles or kilometres depending on the watch). The gradations on the dial are based on the understanding that sound travels at a speed of 3.4 metres through the air.
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