20 eTrex Owner’s ManualNavigationCalibrating the BarometricAltimeterYou can manually calibrate thebarometric altimeter if you knowthe correct elevation or the correctbarometric pressure.1. Go to a location where the elevationor barometric pressure is known.2. Select Elevation Plot > menu >Calibrate Altimeter.3. Follow the on-screen instructions.Trip ComputerThe trip computer displays your currentspeed, average speed, maximumspeed, trip odometer, and other helpfulstatistics.To customize the trip computer, seepage 28.Resetting the Trip DataFor accurate information, reset the tripinformation before beginning a trip.Select Trip Computer > menu >Reset > Reset Trip Data > Yes.All of the trip computer values areset to zero.