The default setting is WGS 84. The unit automatically selects thebest datum depending on your chosen location format.WARNING: Selecting the wrong map datum can result insubstantial position errors. When in doubt, use the default WGS84 datum for best overall performance.Selecting a Different Heading ReferenceYou can select from Auto Mag Var, True, Grid, and User Mag Var.Auto Mag Var provides magnetic north heading references that areautomatically determined from your current location. True providesheadings based on a true north reference. Grid provides headingsbased on a grid north reference (and is used in conjunction withthe grid position formats). User Mag Var allows you to specify themagnetic variation at your current location and provides magneticnorth heading references based on the variation you enter. Enterthe magnetic variation of your current location in the MagneticVariation field if you selected User Mag Var for the heading.WARNING: If User Mag Var is selected, the unit does notautomatically calculate and update the magnetic variation atyour present location. You must update the magnetic variation asyour location changes. Failure to update this setting can resultin substantial differences between the information shown on yourunit and external references, such as a magnetic compass.Welcome Sub TabUse the Welcome sub tab to enter information, such as your nameand address, or a welcome message that appears when the unit isturned on. This feature is helpful if your unit is ever misplaced.To access the Welcome sub tab:1. Press MENU twice to open the Main Menu.2. Use the ROCKER to select Setup tab, and then select theWelcome sub tab.Welcome Sub TabTo add a welcome message:1. Press up or down on the ROCKER to highlight one of theWelcome Message fields, and press ENTER.2. Use the ROCKER to enter information in the fields. You donot need to enter information in every field. When finished,press ENTER again.GPSMAP 276C Owner’s Manual 85M AIN MENU > SETUP TAB
