133Section 6GPS ReceiverReferenceHeading— lets you select the reference used incalculating heading information. You can select from ‘AutoMV’, ‘True’, ‘Grid’ and ‘User MV’. ‘Auto MV’ providesmagnetic north heading references which are automaticallydetermined from your current position. ‘True’ providesheadings based upon a true north reference.Grid— provides headings based on a grid northreference and is used in conjunction with the gridposition formats.User MV— allows you to specify the magnetic variationat your current position and provides magnetic north headingreferences based upon the variation you enter.Altitude— lets you select altitude readouts in ‘Feet’or ‘Meters’.Alarms— Clock Alarm uses the internal clock toprovide an ‘Alarm Clock’ message at the time you set.The unit must be powered on when the alarm time isreached or the message will not occur.To enable/disable the alarm clock:1. Highlight the ‘Clock Alarm’ field and press ENTER.2. Select ‘On’ or ‘Off’ (as desired) and press ENTER.3. If enabling the alarm, highlight the time field (to theimmediate right) and press ENTER. Enter the alarmtime using the ARROW keypad and press ENTER.Arrival Alarm provides an alarm message once you’vecome within a set distance from your destinationwaypoint. As you approach the destination waypoint, an‘Arrival at ____’ message occurs when you are within thealarm distance you entered.Off Course Alarm provides an alarm message (‘OffCourse Alarm’) when you deviate off course beyond thespecified limits.To set the arrival and/or off course alarms:1. Highlight the ‘Arrival Alarm’ or ‘Off Course Alarm’field and press ENTER.An ‘Approaching’message automaticallyappears one minutebefore reaching thedestination waypoint.The arrival alarm allowsyou to set a distance-defined message.The ‘Off Course Alarm’provides an alert if youdrift off course beyondthe limits you have set.
