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7. About the recorded NMEA sentence for GPS logging
A7603-5EX-2 © 2020–2021 Icom Inc.Nov. 2021
qGGA protocol header ($GPGGA)
wUTC of position (16:12:29.487)
eLatitude (North 37º 23.2475′) N=North, S=South
rLongitude (West 121º 58.3416′)E=East, W=West
tGPS quality indicator (1)
0=Fix not available or invalid, 1=SPS mode
2=DGPS (SPS), 6=Estimated (Dead Reckoning) mode
yNumber of satellites in use (7), 00–12
uHorizontal Dilution of Precision (1.0) 0.0–50.0
iAltitude re: mean-sea-level (geoid), meters
(9.0 meters)
oGeoidal 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 iu o !1 !2
t!0
GGA sentence
(e.g.) $GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M,25.5,M,3,0000*18<CR><LF>
qRMC protocol header ($GPRMC or $GNRMC*)
* When both the GPS and GLONASS satellites are used.
wUTC of position (16:12:29.487)
eStatus (A) A=Data valid
V=Data invalid/not positioned
rLatitude (North 37º 23.2475′)N=North, S=South
tLongitude (West 121º 58.3416′)E=East, W=West
ySpeed over ground (0.13 knots)
uCourse Over Ground (309.62º; degrees True)
0.00º–359.99º
iUTC date of position (’20 Nov 31st) ddmmyy
oMode 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.
yMode 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)
iEnd code
*Blank shows when not positioned.
q w r t y iu !0 !1
eo
RMC sentence
(e.g.) $GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,311120, , ,D*10<CR><LF>
qVTG protocol header ($GPVTG or $GNVTG*)
* When both the GPS and GLONASS satellites are used.
wCourse Over Ground (309.62º; degrees True)
0.00º–359.99º
eCourse over ground degrees; Magnetic north
rSpeed over ground, knots (0.13 knots)
tSpeed over ground, kilometer per hour (0.2 km/hr)
q w
VTG sentence
(e.g.) $GPVTG,309.62,T, ,M,0.13,N,0.2,K,A*03<CR><LF>
qGSA protocol header ($GPGSA or $GNGSA*)
* When both the GPS and GLONASS satellites are used.
wMode indicator 1 (A)
M=Manual, forced to operate in 2D or 3D mode
A=Automatic, allowed to automatically switch 2D/3D
eMode indicator 2 (3)
1=Fix not available,
2=2D (using satellites; less than 3),
3=3D (using satellites; more than 4)
rID numbers of satellites used in solution (07, 02, 26, 27, 09, 04…15)
01–32 *Shows up to 12 ID’s
tPosition Dilution of Precision (1.8) 0.0–50.0
yHorizontal Dilution of Precision (1.0) 0.0–50.0
uVertical Dilution of Position (1.5) 0.0–50.0
i
Check Sum (*33) Error detection data started with “*” (hex code)
oEnd code
*Blank shows when not positioned.
q r t y u i o
we
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 ye
Regarding the GPS logging data of the transceiver, each sentence corresponds to the NMEA standard and is recorded
in the following format.