Altimeter

Altimeter Watch
Finding your way in the woods is important. You must be able to return to your car at the end of the day and return to your collecting site again in the future.

A sub-dial is a smaller dial set within the watch’s main dial. Common sub-dials are used as stopwatches or timers, date windows or even altimeters.
Substantial
Jewelry that is either large, heavy or laden with gemstones.

See also: Surface, Rough, Mineral, Rock, Minerals