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I had to replace the Core's battery about 2 weeks ago, about 8 months after I got the watch. For about a month before I finally replaced the battery, the compass would only point West, and when I turned on the backlight the numerals disappeared, so actually I only got about 7 months of full use from the factory battery. Happily, with a $5 replacement from Radio Shack, the watch is functioning correctly again.

	Suunto Core - Click for more info The Suunto Core is the benchmark of Suunto's ABC (Altimeter, Barometer, Compass) wristop computers, furnishing the best features of top-selling Suunto predecessors, and then advancing upon their legacy with innovative environmental monitoring functions that any outdoor adventurer will find invaluable. The Suunto Core is the culmination of years of testing, research, user feedback from the field, and technological advancements in the Suunto laboratory.

	Compass Compasses are sensitive, absolutely crucial instruments to precision navigation. The earth's magnetic field, inclination, and your longitude and latitude all influence the horizontal plane of a compass needle. As a result, compasses are balanced for different geographical zones. Suunto Compasses overcome this limitation to traditional compasses by using a simple 'Two Zone System'. With a Suunto Compass, the only 'balancing zones' are the northern and southern hemispheres. In addition to this innovation, certain Suunto Compasses come equipped with useful features like luminous needles and marks, centimeter/inch scales, magnifying glasses, clinometers, sighting notches, and more.