This is the watch that incorporates an integrated altimeter, digital compass, thermometer, and barometer in our lightweight device, ensuring accurate readings of ambient conditions, and the watch receives time signals from the Atomic Clock, automatically updating in accordance with the official U.S. government clock for the most accurate time in the world. The watch can synchronize with an atomic time signal from up to 2,000 miles away from one of the atomic transmitters located in Fort Collins, Colorado; Rugby, England; Mainflingen, Germany; Fukushima and Fukuoka, Japan, automatically updating for Daylight Saving and leap year changes while only requiring you to set your current location at the touch of a button. The altimeter has a range of -2,300' to 32,800' and monitors and displays the altitude on the watch face every two minutes (and stores readings with the temperature every fifteen minutes), graphing your position in relation to your intended mark while sounding an alarm as you reach the summit. The barometer automatically takes readings every two hours and graphically displays the barometric pressure for the previous 26 hours (ranges from 260 to 1,100 hPa/mb or 7.65 to 32.45 inHg), and the thermometer automatically checks and displays the ambient temperature every five minutes, converting from Celsius to Fahrenheit at the touch of a button. The digital compass takes readings in one of 16 directions, and the watch can record up to five compass readings with the concurring date and time. With back-lit LED face, water-resistance up to 300', Greenwich Mean Time calibration in 30 world cities and across 29 time zones, and a solar powered battery that will hold a full charge for five months without any additional exposure to light.