Garmin GPS 16HVS Instruction Manual - Page 8

GPS Data

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Garmin 16-HVS GPS Receiver 3. GPS Data The Garmin16-HVS has several data formats available. The Garmin16-HVS is configured to output the NEMA $GPGGA time and position string. It is possible to configure the Garmin16-HVS to output other NEMA strings including the $GPVTG track made good and ground speed string. See Appendix D for details. Sample NEMA $GPGGA data string: $GPGGA,hhmmss,llll.lll,a,nnnnn.nnn,b,t,uu,v.v,w.w,M,x.x,M,y.y,zzzz*hh TABLE 3-1. NEMA $GPGGA String Definition Field 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Description $GPGGA hhmmss 1111.111 a nnnnn.nnn b t uu v.v w.w M x.x M y.y zzzz * hh NEMA string identifier UTC of Position: Hours, minutes, seconds Latitude: Degrees, minutes, thousandths of minutes N (North) or S (South) Longitude: Degrees, minutes, thousandths of minutes E (East) or W (West) GPS Quality Indicator: 0 = No GPS, 1 = GPS, 2 = DGPS Number of Satellites in Use Horizontal Dilution of Precision (HDOP) Antenna Altitude in Meters M = Meters Geoidal Separation in Meters M = Meters. Geoidal separation is the difference between the WGS-84 earth ellipsoid and mean-sealevel. Age of Differential GPS Data. Time in seconds since the last Type 1 or 9 Update Differential Reference Station ID (0000 to 1023) Asterisk, generally used as the termination character Checksum Carriage return, line feed characters. Sample $GPGGA output strings: Cold Start No satellites acquired, Real Time Clock and Almanac invalid: $GPGGA,,,,,,0,00,,,,,,,*66 Warm Start No satellites acquired, time from Real Time Clock, almanac valid: $GPGGA,235032.0,,,,,0,00,,,,,,,*7D 4

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Garmin 16-HVS GPS Receiver
3.
GPS Data
The Garmin16-HVS has several data formats available.
The Garmin16-HVS is
configured to output the NEMA $GPGGA time and position string.
It is
possible to configure the Garmin16-HVS to output other NEMA strings
including the $GPVTG track made good and ground speed string.
See
Appendix D for details.
Sample NEMA $GPGGA data string:
$GPGGA,hhmmss,llll.lll,a,nnnnn.nnn,b,t,uu,v.v,w.w,M,x.x,M,y.y,zzzz*hh<CR><LF>
TABLE 3-1.
NEMA $GPGGA String Definition
Field
Description
0
$GPGGA
NEMA string identifier
1
hhmmss
UTC of Position: Hours, minutes, seconds
2
1111.111
Latitude: Degrees, minutes, thousandths of minutes
3
a
N (North) or S (South)
4
nnnnn.nnn
Longitude: Degrees, minutes, thousandths of minutes
5
b
E (East) or W (West)
6
t
GPS Quality Indicator: 0 = No GPS, 1 = GPS, 2 =
DGPS
7
uu
Number of Satellites in Use
8
v.v
Horizontal Dilution of Precision (HDOP)
9
w.w
Antenna Altitude in Meters
10
M
M = Meters
11
x.x
Geoidal Separation in Meters
12
M
M = Meters.
Geoidal separation is the difference
between the WGS-84 earth ellipsoid and mean-sea-
level.
13
y.y
Age of Differential GPS Data.
Time in seconds since
the last Type 1 or 9 Update
14
zzzz
Differential Reference Station ID (0000 to 1023)
15
*
Asterisk, generally used as the termination character
16
hh
Checksum
17
<CR><LF>
Carriage return, line feed characters.
Sample $GPGGA output strings:
Cold Start
No satellites acquired, Real Time Clock and Almanac invalid:
$GPGGA,,,,,,0,00,,,,,,,*66
Warm Start
No satellites acquired, time from Real Time Clock, almanac valid:
$GPGGA,235032.0,,,,,0,00,,,,,,,*7D
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