Keep an eye on it and the atmospheric pressure. What you can do to trick the watch is use a vacuum cleaner to raise the perceived altitude of the watch then calibrate the altimeter (pull out and rotate the crown) and change the altimeter reading to, say, 200 metres. If this happens alot, you probably live fairly close to sea level. ![]() Or wait till the pressure goes up to, say, 1022 and reset the altimeter. The watch will display zero or maybe 5 metres. Wait till the barometer reads 1013 or 1012 and reset the altimeter. So if the measured air pressure is greater than 1013.25 mb and the altimeter is reset (select altimeter, pull out the crown 1 click and press and hold the lower left button) the watch will display LO. ![]() The Timex ABT does not display negative altitude values. This watch calculates altitude by measuring air pressure and relating that value to the international standard atmosphere.
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