V Tight Gel Stopwatch or GPS wrist-unit: This is like an odometer, timer, and speedometer for your body. It tells you accurately how far you have run or walked, tells you the length of your training session, and tells you your pace (in, say, minutes per mile). You can use online or offline map software to tell you a training route's distance. And you can use V Tight Gel a stopwatch to tell you a training session's duration. But you need a GPS unit to know your average or instantaneous running or walking pace at any given moment during .