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Table 8-1
describes each field for the first of the three GPGSV messages in the example:
$GPGSV,3,1,12,21,71,000,,27,68,000,34,08,62,000,33,29,52,000,,*71
Table 8-1
If no CNO value is reported for a particular satellite (satellites 21 and 29 in the table) the receiver is
currently not tracking that satellite.
For more information, refer to the following document, available at http://www.nmea.org/pub/0183/.
NMEA 0183, Standard For Interfacing Marine Electronic Devices
Chapter 8
GPGSV Fields
GPGSV Field
Description
$GPGSV,
3,
Number of GPGSV messages in this set
1,
Number of this GPGSV in the set (1 of 3)
12,
Total number of satellites in view
21,71,000,,
Satellite 21, elevation 71, azimuth 0, CNO unknown
27,68,000,34
Satellite 27, elevation 68, azimuth 0, CNO 34
08,62,000,33,
Satellite 8, elevation 62, azimuth 0, CNO 33
29,52,000,,
Satellite 29, elevation 52, azimuth 0, CNO unknown
*71
Checksum
GPS Modulation (Option 409)
Real Time MSGPS
207
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