Same great features as the Xplorer 2, but this compact and rugged unit has an altimeter/barometer and digital compass (which is useful in determining wind direction). With a press of the button, scroll through the air pressure for the past 24 hours; an essential feature for judging changing conditions. Range Accuracy. Wind: up to 94 mph +/- 3%. Temp: -40 to 176 F +/- 0.5 F. Comp: 0 to 359 off N +/- 5 , Barometer to 31.00 inHg +/- .01 inHg. Alt. to 26,247 ft +/- 10 ft.