for 3 hrs last night i had a reading of '0' ft, which was spot on accurate. i go to bed, 6hrs later the reading is 40 ft. i reset the altitude to '0' again, when i get to work, which is approx 80 ft above sea level, the reading is fluctuating between 120 feet and 60 feet. the barometric has moved only slightly. am i expecting too much fr this watches altitude function? would a suunto do better, or would the upgrade be only a slight improvement? thanks for your help. i'm driving myself crazy w this!!!!