Suunto Observer's altimeter has a range up to 9 000 m/29 500 ft with a 1 m/3 ft resolution. It features an altitude alarm as well as memory function for storing logs of your adventures. The logbook allows the user to record total and cumulative vertical ascents and descents, as well as the number of runs skied. The logbook data is quickly available during the activity with one button press. Its barometric functions provide you with valuable information for forecasting weather changes. Knowing your altitude, ascent/descent rate, compass bearing, weather trends, and barometric pressure enables you to make safe and responsible decisions. The Altimeter uses a unique feature that keeps the sea-level pressure reading from changing when the unit is used as an altimeter. When the altimeter function is activated, all pressure changes are interpreted as altitude changes, and the sea-level pressure reading displayed will not change, although the absolute pressure reading does. In addition to current barometric pressure and temperature, the barometer function gives pressure related data for the past four days: the first six hours in one hour intervals and after that in six hour intervals. The Barometer uses a unique feature that keeps the altitude reading from changing when the unit is used as a barometer. It interprets all pressure changes as weather changes and the measured changes will therefore only affect the pressure reading in the barometer mode. These changes will not affect the altitude reading, thus enabling instant weather forecasts. The compass shows the cardinal or half-cardinal point abbreviated and indicates the North with an arrow. The compass can be set to track a certain bearing, and graphically show the difference between it and the actual bearing. This is a valuable tool, when trying to get back on track after minor or major detours. The declination adjustment function allows the user to correct the difference between true North and magnetic North. It also has a calendar clock pre-programmed to the year 2089 with three daily alarms, a dual time display, and a stopwatch with lap and split time measurement. The stopwatch stores up to 99 laps and split times for one run. The time can either be shown in 12 or 24-hour format.