Icom IC-705 Advanced Manual page 113

12. GPS OPERATION (ADVANCED)
GPS Logger function
TIP: About the recorded NMEA sentence for GPS logging
Regarding the GPS logging data of the IC-705, each sentence corresponds to the NMEA standard and is
recorded in the following format.
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
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
RMC sentence
D
(e.g.) $GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,311017, , ,D*10<CR><LF>
q
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)
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)
GSA sentence
D
(e.g.) $GPGSA,A,3,07,02,26,27,09,04, , , , , ,15,1.8,1.0,1.5*33<CR><LF>
q
we
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
VTG sentence
D
(e.g.) $GPVTG,309.62,T, ,M,0.13,N,0.2,K,A*03<CR><LF>
q w
q VTG protocol header ( $GPVTG or $GNVTG*)
* When both the GPS and GLONASS satellites are used.
w Course Over Ground (309.62º; degrees True)
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)
w e
w r
e
A=Data valid
V=Data invalid/not positioned
0.00º–359.99º
r
r t u
e y
0.00º–359.99º
r y u i
t
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.
t y u
i UTC date of position ('17 Oct 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.
t y u i o
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.
i
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.
12-30
!1 !2
o
!0
i !0 !1
o