Seatex DPS 200 Installation Manual, rev. 4 Installation
27
GGA Message
The GGA message contains time, position and GPS data. The message is as specified in
NMEA 0183 versions 2.2, 2.3 and 3.0. The message structure is as follows:
$GPGGA,hhmmss.ss,ddmm.mmmmmm,s,dddmm.mmmmmm,s,q,nn,h.h,a.a,M,g.g,M,a.a,
rrrr*cc
Table 9 describes the GGA message fields.
Field Description
hhmmss.ss UTC of position (hours, minutes, seconds).
ddmm.mmmmmm Latitude (degrees, minutes and fractions of minutes).
s Latitude sector, N - North or S - South.
dddmm.mmmmmm Longitude (degrees, minutes and fractions of minutes).
s Longitude sector, E - East or W - West.
q GPS Quality indicator: 0 = Fix not valid, 1 = GPS fix, 2 = DGPS fix.
nn Number of satellites in use, 00 - 12.
h.h HDOP - horizontal dilution of precision 00.0 to 99.9.
a.a Altitude, reference: mean-sea-level (geoid).
M Altitude unit, M = meters.
g.g Geoidal separation: the difference between the WGS-84 ellipsoid and
mean-sea-level (geoid).
M Geoidal separation unit, M = meters.
a.a Age of differential corrections, in seconds. 0 when DGPS not used.
rrrr Differential reference station ID, 0000-1023.
*cc Checksum.
Table 9 GGA message fields
GGA_1.5 Message
The GGA_1.5 message contains time, position and fix related GPS data. The message is as
specified in NMEA 0183 version 1.5. The message structure is as follows:
$GPGGA,hhmmss.ss,ddmm.mmmmmm,s,dddmm.mmmmmm,s,q,n,hhh,uaa,M,uggg,M*cc
Table 10 describes the GGA_1.5 message fields.
Field Description
hhmmss.ss UTC of position (hours, minutes, seconds).
ddmm.mmmmmm Latitude (degrees, minutes and fractions of minutes).
s Latitude sector, N - North or S - South.
dddmm.mmmmmm Longitude (degrees, minutes and fractions of minutes).
s Longitude sector, E - East or W - West.
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