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Magellan NAV 6000 81
different from the number in view)
8 Horizontal dilution of precision
9 Antenna altitude above/below mean sea level
10 Units of antenna altitude, meters
11 Geoidal separation - difference between the
WGS-84 earth ellipsoid and mean sea level
(geoid), “-” = mean sea level below ellipsoid
12 Units of geoidal separation, meters.
13 Age of Differential GPS data - Time in seconds
since last SC104 Type 1 or 9 update, null field
when DGPS is not used
14 Differential reference station ID, 0000-1023
GLL Geographic Position — Latitude/Longitude
1 2 3 4 5 6
GLL,1111.11,a,yyyyy.yy,a,hhmmss.ss,A*hh
1-2 Latitude, N/S
2-3 Longitude, E/W
4 UTC of position
6 Status A = Data valid
V = Data not valid
GSA GPS DOP and Active Satellites
GPS receiver operating mode, satelites used in the
navigation solution rproted by the $--GGA sen-
tence, and DOP values.
1 2 3 4 5 6 7
GSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,x.x,x.x,x.x*hh<CR><LF>,
1 Mode: M=Manual, forced to operate in 2D or 3D
mode, A=Automatic, allowed to automatically
switch 2D/3D
2 Mode: 1= Fix not available, 2=2D, 3=3D
3-4 PRN numbers of satellites used in solution
(null for unused fields)
5 PDOP
6 HDOP
7 VDOP
GSV GPS Satellites in View
Number of satellites (SV) in view, PRN numbers,
elevation, azimuth and SNR value. Four satellites
maximum per transmission, additional satellite
data sent in second or their message. Total number
of messages being transmitted and the number of
messages being transmitted is indicated in the
first two fields.