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.
qweryi
For your information— About the recorded NMEA sentence for GPS logging
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)
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 Tr ue)
0.00º–359.99º
i UTC date of position
(’11 May 12th) yymmdd
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.
qw rtyiu !0 !1
e
o
D
RMC sentence
(e.g.)
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120511, , ,D*10<CR><LF>
q VTG protocol header ($GPVTG)
w Course Over Ground (309.62º; degrees Tr ue)
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)
qw
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)
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.
qrt y u i o
w
e
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
ye
Regarding the GPS logging data of the ID-31A/E, each sentence corresponds to the NMEA standard and is
recorded in the following format.
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