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in GPS mode 2. It is used by PC software programs to track ATLAS PL
transponders, and process their status information.
13.1.
$GPTLL Target Lat-Lon
This sentence is typically used by marine radar plotters. When the ATLAS PL is
set to GPS 3 mode of operation, it will output this message every time it receives a
position report from another ATLAS PL transponder. Within the TLL message, is
the latitude, longitude, and Target ID". In the Target ID field, the ATLAS PL puts the
ID of the RV-M7 that transmitted its position.
$GPTLL,1,2,3,4,5,6,7,8,9 * cks
Field
Usage
$ GPTLL
Target number
1
Lat
2
N/S
3
Lon
4
E/W
5
UTC time
6
Target Name
7
Status
8
Reference
9
cks
Example:
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
13.2.
$GPGSV Satellites In View
When this message comes out of the ATLAS PL, it identifies the number of
satellites its internal GPS has in view. Up to 3 satellites may be reported in one
message. The ATLAS PL 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
$ GPGSV
1
M7 PL Technical Manual
Comments
TLL header
01-99. Note the 99 target limit of most systems. If the ID is greater
than 99, the ATLAS PL will only output 2 digits.
Latitude of the point.
North or South. One character.
Longitude of the position
East or west. One character.
The UTC time at the time the transmission was made. Hhmmss format.
The ID of the unit that transmitted its postion. If a Prefix" is programmed into the RV-
M7, the name will have the prefix charactors in front of the ID. If additional
parameters were selected to be appended, these will be put at the end of the name.
See the "TLLPARM" command for a list of possible parameters. All parameters are
enclosed in one set of parenthesis after the ID number.
The character T, for tracking.
Null field. No data
NMEA checksum
Usage
Comments
Number of SVs in view, PRN numbers, elevation,
azimuth & SNR values.
Count
Total number of messages of this type in this cycle
41
Raveon Technologies Corp.
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