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Juniper Systems LandMark CE User Manual

Page 44

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44 LandMark CE User’s Manual

Manual Mag

The Manual Mag value uses a negative (-) number for East
declination and a positive (+) number for West declination. When
manually entering the declination, use the box to the right of the
Heading drop-down menu and specify either East (using a negative
value) or West (using a positive value).

WMM 2K

Earth’s magnetic fi eld, as measured by a magnetic sensor on or
above the Earth’s surface, is a composite of several magnetic fi elds
generated by a variety of sources.

The World Magnetic Model Epoch 2000 (WMM-2000 or WMM 2K) is
a generated model used to confi gure and display magnetic north on
GPS units. The World Magnetic Model coeffi cients are produced and
distributed by the National Geospatial Intelligence Agency (formerly
National Imagery Mapping Agency), Washington, D.C.

The model, associated software, and documentation are distributed
by NGDC on behalf of NGA. The model is produced at 5-year
intervals. The 2005 - 2010 model will be available from NGDC on the
following website on 12/2004:

http://www.ngdc.noaa.gov/seg/WMM/DoDWMM.shtml

Follow the direction on the above website to download the necessary
fi le. Once the fi le is downloaded, place the fi le in the LandMark CE
folder on your Allegro.

Note: Some GPS receivers may not supply the magnetic declination.

If your GPS receiver uses the Sirf chipset, it probably does not provide the
magnetic declination value.

Format

The Format option allows you to select the format for displaying
your location. Latitude/ longitude can be set to degrees, degrees
and minutes, or degrees, minutes, and seconds; UTM can be set to a
northing/easting format.

Format

What is Displayed

ddd.ddddddd

latitude/longitude in decimal degrees

ddd mm.mmmm

latitude/longitude in degrees and decimal
minutes

ddd mm mss.ss

latitude/longitude in degrees, minutes and
seconds

UTM

northings/eastings

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