This watch-face includes the time, day of the week, date, steps, heart rate, elevation & pressure, floors, and battery level. The elevation is based on the barometer sensor and there for changes based on the atmospheric pressure, which may be +/- 500ft. FYI--In stormy/rainy/overcast weather the atmospheric pressure will tend to read lower, in turn lowering the elevation.
Do NOT depend on the elevation and barometer for personal safety. I will not be responsible for any damage or injuries.