8
7. About the recorded NMEA sentence for GPS logging
A7603-5EX-2 © 2020–2021 Icom Inc.
Nov. 2021
q
GGA protocol header (
$GPGGA)
w
UTC
of position (16:12:29.487)
e
Latitude (North
37º 23.2475
′
) N=North, S=South
r
Longitude (West 121º
58.3416
′
) E=East, W=West
t
GPS quality indicator (1)
0=Fix not available or invalid, 1=SPS mode
2=DGPS (SPS), 6=Estimated (Dead Reckoning) mode
y
Number of satellites in use (7), 00–12
u
Horizontal Dilution of Precision (1.0) 0.0–50.0
i
Altitude re: mean-sea-level (geoid), meters
(9.0 meters)
o
Geoidal separation, meters (25.5 meters)
!0
Age of Differential GPS data (3 seconds)
!1
Check Sum (*18) Error detection data started with “*” (hex code)
!2
End code
*Blank shows when not positioned.
q
w
e
r
y
i
u
o
!1
!2
t
!0
D
GGA sentence
(e.g.) $GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M,25.5,M,3,0000*18<CR><LF>
q
RMC protocol header (
$GPRMC or $GNRMC*)
* When both the GPS and GLONASS satellites are used.
w
UTC of position (16:12:29.487)
e
Status (A)
A=Data valid
V=Data invalid/not positioned
r
Latitude (North 37º 23.2475
′
)
N=North, S=South
t
Longitude (West 121º
58.3416
′
) E=East, W=West
y
Speed over ground (0.13 knots)
u
Course Over Ground (309.62º; degrees True)
0.00º–359.99º
i
UTC date of position (’20 Nov 31st) ddmmyy
o
Mode Indicator (D)
A=Autonomous mode, D=DGPS,
E=Estimated (dead reckoning) mode,
N=Data not valid, R=Almanac data
!0
Check Sum (*10) Error detection data started with “*” (hex code)
!1
End code
*Blank shows when not positioned.
y
Mode Indicator (A)
A=Autonomous mode, D=DGPS,
E=Estimated (dead reckoning) mode,
N=Data not valid, R=Almanac data
u
Check Sum (*03) Error detection data started with “*” (hex code)
i
End code
*Blank shows when not positioned.
q
w
r
t
y
i
u
!0
!1
e
o
D
RMC sentence
(e.g.) $GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,311120, , ,D*10<CR><LF>
q
VTG protocol header (
$GPVTG or $GNVTG*)
* When both the GPS and GLONASS satellites are used.
w
Course Over Ground (309.62º; degrees True)
0.00º–359.99º
e
Course over ground degrees; Magnetic north
r
Speed over ground, knots (0.13 knots)
t
Speed over ground, kilometer per hour (0.2 km/hr)
q
w
D
VTG sentence
(e.g.) $GPVTG,309.62,T, ,M,0.13,N,0.2,K,A*03<CR><LF>
q
GSA protocol header (
$GPGSA or $GNGSA*)
* When both the GPS and GLONASS satellites are used.
w
Mode indicator 1 (A)
M=Manual, forced to operate in 2D or 3D mode
A=Automatic, allowed to automatically switch 2D/3D
e
Mode indicator 2 (3)
1=Fix not available,
2=2D (using satellites; less than 3),
3=3D (using satellites; more than 4)
r
ID numbers of satellites used in solution (07, 02, 26, 27, 09, 04…15)
01–32 *Shows up to 12 ID’s
t
Position Dilution of Precision (1.8) 0.0–50.0
y
Horizontal Dilution of Precision (1.0) 0.0–50.0
u
Vertical Dilution of Position (1.5) 0.0–50.0
i
Check Sum (*33) Error detection data started with “*” (hex code)
o
End code
*Blank shows when not positioned.
q
r
t y u i
o
we
D
GSA sentence
(e.g.) $GPGSA,A,3,07,02,26,27,09,04, , , , , ,15,1.8,1.0,1.5*33<CR><LF>
u
i
r
t
y
e
Regarding the GPS logging data of the transceiver, each sentence corresponds to the NMEA standard and is recorded
in the following format.
