Garmin etrexlegend tm 用户手册

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The Units features are best used by individuals with 

a working knowledge of map grids and datums. To learn 
more about these subjects, visit the  National Imagery and 
Mapping Agency at http:// www.nima.mil or inquire at 
your library.

 Position Format - Allows you to choose from 

different grid formats. The default position format, 
‘hddd°mm.mmm’ displays the latitude and longitude in 
degrees and minutes and is most commonly used.

 Map Datum - Offers a selection of nearly all map 

datums in common use. Every map is based on a map 
datum (a reference model of the earth’s shape) and is 
usually listed in the title block of the map. If you are com-
paring GPS coordinates to a paper map, chart, or other 
reference, the map datum in this fi eld must match the 
horizontal map datum used to generate the map or other 
reference. The default datum is  WGS 84 (World Geodetic 
Survey 1984). If a map does specify a datum, use the 
options list to fi nd datums applicable to the region of the 
map, selecting the one that provides the best positioning 
at a known point. If necessary, you also may choose the 
‘User’ datum for custom designed grids.

  Distance/ Speed - You can choose from three  units of 

measure 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 of 

measure to display your rate of ascent and descent.

 Depth - You can choose from three units of measure 

to display the depth of an area shown on a map.

1.   For all fi elds on this page, highlight the fi eld and 

then press the CLICK STICK to display the Options 
Menu for the fi eld.

2.   Highlight the desired option on the menu and then 

press the CLICK STICK to place it in the fi eld. 

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10/11/2002, 9:49:34 AM