Garmin eTrex Legend Owner's Manual And Reference Manual

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44Units PageThe Units features are best used by individuals witha working knowledge of map grids and datums. To learnmore about these subjects, visit the National Imagery andMapping Agency at http://www.nima.mil or inquire atyour library.Position Format - Allows you to choose fromdifferent grid formats. The default position format,‘hddd°mm.mmm’ displays the latitude and longitude indegrees and minutes and is most commonly used.Map Datum - Offers a selection of nearly all mapdatums in common use. Every map is based on a mapdatum (a reference model of the earth’s shape) and isusually listed in the title block of the map. If you are com-paring GPS coordinates to a paper map, chart, or otherreference, the map datum in this field must match thehorizontal map datum used to generate the map or otherreference. The default datum is WGS 84 (World GeodeticSurvey 1984). If a map does specify a datum, use theoptions list to find datums applicable to the region of themap, selecting the one that provides the best positioningat a known point. If necessary, you also may choose the‘User’ datum for custom designed grids.Distance/Speed - You can choose from three units ofmeasure to display your rate of travel.Elevation - You can choose from two units of mea-sure to display your elevation.Vertical Speed - You can choose from three units ofmeasure to display your rate of ascent and descent.Depth - You can choose from three units of measureto display the depth of an area shown on a map.To select Units Page options:1. For all fields on this page, highlight the field andthen press the THUMB STICK to display theOptions Menu for the field.2. Highlight the desired option on the menu and thenpress the THUMB STICK to place it in the field.Setup OptionsMain MenuUnits PagePosition FormatOptions MenuMap Datum OptionsMenuDepth OptionsVertical SpeedOptionsDistance/SpeedOptionsElevation Options