Position Page (cont)To reset timer, speed measurement, or odometer:1. Highlight the user-selectable field, and press E.2. Press E to confirm or Q to exit.The trip odometer, trip timer, and average speedfields are linked. Resetting one of these options in auser-selectable field will automatically reset the corre-sponding data in the other. This ensures that informa-tion shown in these fields reflects your current trip.Maximum Speed FieldTo obtain the most accurate reading of averagespeed, keep in mind that due to the sensitivity of theGPS 48’s antenna, your maximum speed value mayinclude the effects of rapid movement, such as swingingyour arm while holding the unit.To reset the maximum speed field:1. Highlight the ‘MXSPD’ field, and press E.2. Press E to confirm the ‘RESET?’ prompt .Altitude FieldWhen the GPS 48 is acquiring satellites or navigat-ing in the 2D mode, the last known altitude is used tocompute your position. In cases where the GPS 48 has2D coverage, entering your exact altitude will enable thereceiver to determine a more accurate fix.Note: Altitude can only be entered when the receiv-er is in the 2D mode.To enter an altitude:1. Highlight the ‘ALT’ field, and press E.2. Enter a value, and press E.Note: Use caution when entering a 2D altitude,entering an incorrect altitude may significantly degradeposition accuracy.Maximum Speed& AltitudeFieldsREFERENCE18The user selectable fieldson the Position Page giveyou a variety of informa-tion to choosefrom.Resetting the tripodometer will erase theprevious mileage and setthe odometer to 0.You may enter your exactaltitude to assist the GPS48 in establishing a moreaccurate fix when operat-ing in 2D mode.