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MX421 Installation Manual
4,5 --- Longitude - E/W
6 ----- GPS Quality Indicator:
0=Fix not available or invalid
1=GPS SPS Mode, fix valid
2=Differential GPS, SPS Mode, fix valid
3= GPS PPS Mode, fix valid
7 ----- Number of Satellites in use, 00-12, may be different from the
number in view
8 ----- Horizontal Dilution of Precision (HDOP)
9 -----Antenna altitude/mean-sea-level (geoid)
10-----Units of antenna altitude, Meters
11,12-Geoidal Height, Meters
13---- Age of Differential GPS Data
14 ----Differential Reference Station ID
(2)
GSA
- GPS DOP and Active Satellites
GPS receiver operating mode, satellites used in the navigation solution
reported by the $GPGGA sentence, and DOP values.
$GPGSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,x.x,x.x,x.x*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Notes:
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
3-14 -- PRN numbers of satellites used in solution (null for unused
fields)
15 ---- PDOP
16 ---- HDOP
17 -----VDOP
(3)
GSV
- GPS Satellite in View
Number of satellites (SV) in view, PRN numbers, elevation, azimuth and SNR
values. Four satellites maximum per transmission, additional satellite data
sent in second or third message. Total number of messages being
transmitted and the number of the message transmitted are indicated in the
first two fields.
$GPGSV,x,x,xx,xx,xx,xxx,xx,....................,xx,xx,xxx,xx*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10 11 12
Notes:
1 ------Total number of messages, 1 to 3
2 ----- Message number, 1 to 3
3 ----- Total number of satellites in view
