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.
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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