Marking a PositionThe GPS 12XL allows you to mark and store up to500 positions as waypoints. A waypoint can be enteredby taking an instant electronic fix, by manually enter-ing coordinates (pg. 20), or by using the bearing anddistance to a known position (pg. 20).To mark your present position:1. Press . The mark position page will appear,showing the captured position and a default three-digit name.2. To save a default name and symbol, press toconfirm the ‘SAVE?’ prompt.Position Averaging FunctionThe GPS 12XL positioning averaging function willhelp reduce the effects of selective availability uponposition error when marking a waypoint, providingmore accurate saved positions.1. After you have pressed the key, highlight the‘AVERAGE?’ field and press . The Figure ofMerit (FOM) field will display a value reflecting esti-mated accuracy of the averaged position. Note: Asthe GPS 12XL calculates the FOM, it will rapidlychange initially then begin to stabilize over time.2. The unit will continue averaging until you have high-lighted ‘SAVE?’ and pressed .To enter a different waypoint name:1. Highlight the waypoint name field, and press .2. Make the appropriate changes, and press .3. Highlight ‘SAVE?’, and press .Note: To enter a different waypoint symbol or com-ment, see pg. 21.To add this waypoint to a route:1. Highlight the ‘Add to route number’ field, and press.2. Enter a route number, press to confirm theroute number, and again to save the waypoint.The waypoint will be added to the end of the selectedroute—after any other waypoints already in the route.17After initiating the posi-tion averaging function, aFigure of Merit value willbe displayed, and the‘SAVE?’ field will auto-matically be highlighted.REFERENCEPositionAveragingThe GPS 12XL will savenew waypoints with adefault three-digit name.To add the waypoint to aroute, enter the desiredroute number, highlight‘SAVE?’ and pressENTER.