Selecting a Different HeadingThe Location Setup page also allows you to select adifferent heading. Changing the Heading causes a sta-tus message to appear when you turn on the unit.Setting the Heading.Auto Mag Var—(default) provides magnetic northheading references that are automatically determinedfrom your current position.True—provides headings based upon a true northreference.Grid—provides headings based on a grid north refer-ence (and is used in conjunction with the grid positionformats).User Mag Var—allows you to specify the magneticvariation at your current position and provides mag-netic north heading references based upon the varia-tion you enter. Enter the magnetic variation of yourcurrent position in the Magnetic Variation field ifyou have selected User Mag Var for the heading.WARNING: If User Mag Var is selected, theunit does not automatically calculate and updatethe magnetic variation at your present position.You must update the magnetic variation as yourposition changes. Failure to update this settingmay result in substantial differences between theinformation displayed on your unit and externalreferences, such as a magnetic compass.84 76CS Plus Owner’s ManualC USTOMIZING YOUR 76CS P LUS > C HANGING THE LOCATION SETTINGS190-00507-00_0A.indd 84 2/14/2005 3:33:54 PM
