Garmin GPS 12XL Owner's Manual & Reference

Also see for GPS 12XL - Hiking Receiver: Supplementary guide Specifications Owner's manual & reference

Garmin GPS 12XL Owner's Manual & Reference Manual pdf 49 page image

Navigation Setup: Map Datums (continued)To define a user datum:1. Highlight the ‘MAP DATUM’ field, and press .2. Scroll through the map datum options until ‘User’appears, and press .3. Enter the five parameters of the map datum—‘DX’,‘DY’, ‘DZ’, ‘DA’, and ‘DF’—using the rocker keypad,and press . The signs of each value should fol-low the convention: WGS 84 +/- local geodetic system.4. Highlight ‘SAVE?’, and press .Navigation Setup: CDI ScaleThe course deviation indicator (CDI) field lets youselect the range of the CDI bar scale on the HighwayPage. Four scales are available: +/- 0.02, 0.25 (default),1.25, and 5.0 miles or kilometers. Note: This CDIvalue represents the full scale limits (left or right fromcenter) of the CDI.To enter a CDI scale setting:1. Highlight the ‘CDI’ field, and press .2. Select the desired setting, and press .Navigation Setup: Units of MeasureThe GPS 12XL lets you select statute (default), nau-tical, or metric units of measure for all speed and dis-tance readouts.To change the unit of measure:1. Highlight the ‘UNITS’ field, and press .2. Select the desired units of measure, and press .Navigation Setup: Heading ReferenceThe GPS 12XL’s heading information can be dis-played referencing magnetic north (automatic or user-defined), true north, or calculated grid headings. Thedefault setting is automatically-calculated magneticnorth, which is suitable for most applications.To select a heading reference:1. Highlight the ‘HEADING’ field, and press .2. Select the desired heading reference, and press .To enter a user-defined magnetic heading:. 1. Select ‘User Mag’ and press .2. Enter the degrees and direction of magnetic variation,and press . 45The user datum featureallows you to define theearth model used to calcu-late position coordinates.WARNING: Incorrectentries may result in sub-stantial position errors.REFERENCENavigationSetupTo enter a user-definedmagnetic variation, selectthe ‘User Mag’ option andenter the desired directionand degrees.