Holux GR-213U User Manual page 9

NOTE: Items <4>,<5>,<6> and <7> repeat for each satellite in view to a maximum of four (4) satellites per
sentence. Additional satellites in view information must be sent in subsequent sentences. These fields will be
null if unused.
5.1.5 Recommended Minimum Specific GNSS Data (RMC)
Table 5-9 contains the values for the following example:
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598, ,*10
Table 5-9 RMC Data Format
Name
Message ID
UTC Time
Status
Latitude
N/S Indicator
Longitude
E/W Indicator
Speed Over Ground
Course Over Ground
Date
Magnetic Variation (1)
Checksum
<CR> <LF>
1. SiRF Technology Inc. does not support magnetic declination. All "course over ground" data are geodetic
WGS84 directions.
5.1.6 Course Over Ground and Ground Speed (VTG)
Table 5-10 contains the values for the following example:
$GPVTG,309.62,T, ,M,0.13,N,0.2,K*6E
Table 5-10 VTG Data Format
Name
Message ID
Course
Reference
Course
Reference
Speed
Units
Speed
Units
Checksum
<CR> <LF>
1. SiRF Technology Inc. does not support magnetic declination. All "course over ground" data are geodetic
WGS84 directions.
5.1.7 ZDA—SiRF Timing Message
Outputs the time associated with the current 1 PPS pulse. Each message will be output within a few
hundred ms after the 1 PPS pulse is output and will tell the time of the pulse that just occurred.
Table 5-11 contains the values for the following example:
$GPZDA,181813,14,10,2003,00,00*4F
Example Units
$GPRMC
161229.487
A
3723.2475
N
12158.3416
W
0.13 knots
309.62 degrees
120598
degrees
*10
Example Units
$GPVTG
309.62 degrees
T
degrees
M
0.13 knots
N
0.2 km/hr
K
*6E
Description
RMC protocol header
hhmmss.sss
A=data valid or V=data not valid
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
True
ddmmyy
E=east or W=west
End of message termination
Description
VTG protocol header
Measured heading
True
Measured heading
Magnetic (1)
Measured horizontal speed
Knots
Measured horizontal speed
Kilometers per hour
End of message termination
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