M7 GX Technical Manual
65
Raveon Technologies Corp.
The following sentence is from unit 0006, prefix set to “BUOY”, temperature and
voltage parameters appended.
$GPTLL,06,3308.9098,N,11713.1306,W,BUOY6(27C 12.9V ),41840,T,*06
15.2.
$GPGSV Satellites In View
When this message comes out of the
RV-M7 GX
, it identifies the number of
satellites its internal GPS has in view. Up to 3 satellites may be reported in one
message. The
RV-M7 GX
typically does not report any satellite information other
than the Number of Satellites in view.
$GPGSV,1,2,3,4,5,6,7 * cks
Field
Usage
Comments
$
GPGSV
Number of SVs in view, PRN numbers, elevation,
azimuth & SNR values.
1
Count
Total number of messages of this type in this cycle
2
Message number
This message’s number
3
Number of sats
The total number of satellites in view.
4
PRN
Satellite number.
5
Elevation
Elevation in degrees, 90 maximum
6
Azmuth
Azimuth, degrees from true north, 000 to 359
7
SNR
Signal-to-noise ratio for this sat.
cks
NMEA checksum
15.3.
$GPWPL Waypoint Location
The waypoint location sentence is used by GPS receivers and plotters in different
ways, often to share waypoint data or to show waypoints on-screen.
$GPWPL,1,2,3,4,5,6 * cks
Field
Usage
Comments
$
GPWPL
Waypoint Location Message Header
1
Lat
Latitude of the point.
2
N/S
North or South.
One character.
3
Lon
Longitude of the position
4
E/W
East or west. One character.
5
WP Name
The ID of the unit that transmitted its position plus any user-set
prefix.
cks
NMEA checksum
When the
RV-M7 GX
is set to
GPS 4
mode of operation, it will output this message
every time it receives a position report from another
RV-M7 GX
transponder.
Within the WPL messa
ge, is the latitude, longitude, and “waypoint ID”. In the
