63
Default Map datums
Primary: WGS 84
Secondary: WGS 84
Default Elev mode: 3D
6. Map Datum
This option allows you to define a primary map datum,
and also a secondary map datum if you need one.
A map datum is a geographic reference that MobileMap-
per Pro will refer to to calculate the coordinates of your
position. MobileMapper Pro holds more than 70 different
map datums in its memory.
After selecting the
Map Datum
option from the Setup
menu, choose the map datum from the list that applies to
your country and working area and then press ENTER.
To enter a user map datum, select the term “USER” in the
list of datums arranged in alphabetical order. Then, for
more information on how to enter a user map datum, refer
to the appendix at the end of this manual (page 80).
7. Elev Mode
This option allows you to choose between 3D and 2D
mode.
In 3D mode, MobileMapper Pro will compute the 3 coordi-
nates of your position: horizontal coordinates plus eleva-
tion.
In 2D mode, MobileMapper Pro will not calculate your ele-
vation. Only the horizontal coordinates of your position will
be computed. MobileMapper Pro will assume that the last
computed or entered elevation is your current elevation.
Operating in 3D requires at least 4 tracked satellites
whereas 2D requires only 3.
Consider using the 2D mode when the conditions of recep-
tion are poor or if the working area is relatively flat and
elevation is not important.
After selecting the
Elev Mode
option from the Setup menu,
choose the mode that matches your case of use and then
press ENTER.
Содержание MobileMapper - GPS Software
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Страница 7: ...vii Defining a User Map Datum 80 a and f of Frequently Used Datums 81 Glossary 82 Index 85...
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