Holux GM-82 User Manual
Page 9
GM-82 User’s manual
9
Table 4-8 GSV Data Format
Name Example
Units
Description
Message ID
$GPGSV
GSV protocol header
Number of Messages
(1)
2
Range 1 to 3
Message Number
(1)
1
Range 1 to 3
Satellites in View
07
Satellite ID
07
Channel 1 (Range 1 to 32)
Elevation
79
degrees Channel 1 (Maximum 90)
Azimuth
048
degrees Channel 1 (True, Range 0 to 359)
SNR (C/No)
42
dBHz Range 0 to 99, null when not tracking
.... ....
Satellite ID
27
Channel 4 (Range 1 to 32)
Elevation
27
degrees Channel 4 (Maximum 90)
Azimuth
138
degrees Channel 4 (True, Range 0 to 359)
SNR (C/No)
42
dBHz Range 0 to 99, null when not tracking
Checksum *71
<CR> <LF>
End of message termination
(1). Depending on the number of satellites tracked multiple messages of GSV data may be required.
4.1.5 Recommended Minimum Specific GNSS Data (RMC)
Table 4-9 contains the values for the following example:
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598, ,*10
Table 4-9 RMC Data Format
Name Example
Units
Description
Message ID
$GPRMC
RMC protocol header
UTC Time
161229.487
hhmmss.sss
Status
A
A=data valid or V=data not valid
Latitude 3723.2475
ddmm.mmmm
N/S Indicator
N
N=north or S=south
Longitude 12158.3416
dddmm.mmmm
E/W Indicator
W
E=east or W=west
Speed Over Ground
0.13
knots
Course Over Ground
309.62
degrees True
Date 120598
ddmmyy
Magnetic Variation
(1)
degrees E=east or W=west
Checksum *10
<CR> <LF>
End of message termination
(1). SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are geodetic WGS84
directions.
4.1.6 Course Over Ground and Ground Speed (VTG)
Table 4-10 contains the values for the following example:
$GPVTG,309.62,T, ,M,0.13,N,0.2,K*6E
Table 4-10 VTG Data Format
Name Example
Units Description
Message ID
$GPVTG
VTG protocol header
Course 309.62
degrees
Measured
heading
Reference T
True
Course
degrees
Measured
heading
Reference M
Magnetic
(1)
Speed
0.13
knots
Measured horizontal speed
Units N
Knots