CSI Wireless DGPS MAX, Reference Manual

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DGPS MAX Reference Manual
63
Longitude information is parsed from the
GPGGA
NMEA message. The longitude,
measured to the phase center of the antenna, is
usually referenced to the WGS-84 ellipsoid,
however, some DGPS services result in a
position relating to the North American Datum
1983 (NAD-83). This datum is essentially
equivalent to this ellipsoid, considering the level
of accuracy of this product.
Hgt 1030.40m
This menu item displays the current antenna
height in either meters or feet depending on
the units selected (See Section 4.6.7). The
default unit is meters. This information is
parsed from the NMEA
GPGGA
message.
The altitude, measured to the phase center of
the antenna, is usually referenced to the WGS-
84 ellipsoid, however, some DGPS services
result in a position relating to the North
American Datum 1983 (NAD-83). This datum
is essentially equivalent to this ellipsoid,
considering the level of accuracy of this
product.
Hdg 187.3!t
This item displays the horizontal heading
clockwise from True North in degrees. This
information is parsed from the
GPVTG
NMEA
message string.