This was the market's best GPS clock for long distance races and competitions lasting for several days. Holds for 50 hours, has on / off button, track back function when you want home, barometer, tempratur and altimeter.
What I'm not so happy with is a little tongue-laden menu and the physical back of the clock. The back is made of metal and gets very cold to be on hand for several hours. "Script Teller" is probably the only thing I miss for technical training and for technical training and training.