Alti - Altimeter Mode; Using The Altimeter - Timex INDIGLO Manual Del Usuario

Typically, if you are above sea level, the "local" pressure
value that the watch also displays will be lower than the
sea level pressure (because air pressure decreases with
altitude) and if you are at a point below sea level the local
pressure will be slightly higher.
Incidentally, this difference between sea level air pressure
and the local air pressure is how the watch determines
the altitude.

ALTI - Altimeter Mode

This mode provides altitude and temperature information
to make outdoor activities like hiking, mountain biking and
trail running more enjoyable. The watch will keep track of
the highest altitude you achieved as well as accumulate all
of the positive altitude changes you experience. These
statistics are visible when you first enter ALTI mode.
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Using the Altimeter

Press and release MODE until you see "ALTI" on the dis-
play. After a couple of seconds, the watch will display the
following data, in the order shown, for two seconds each:
• The highest recorded altitude (indicated by "HIGH" in
the lower display line).
• The total accumulated positive altitude changes
(indicated by "ACC" in the lower display line).
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