Rtcm Received Data - Holux GM-83 User Manual

GM-83 User's manual
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
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.
4.1.6 MSK Receiver Signal (MSS)
Table C-9 contains the values for the following example:
$GPMSS,55,27,318.0,100,*66
Name
Message ID
Signal Strength
Signal-to-Noise Ratio
Beacon Frequency
Beacon Bit Rate
Note – The MSS NMEA message can only be polled or scheduled using the MSK NMEA input message.

4.2 RTCM Received Data

The default communication parameters for DGPS Input are 9600 baud, 8 data bits, stop bit, and no
parity. Position accuracy of less than 5 meters can be achieved with the GM-83 by using Differential GPS
(DGPS) real-time pseudo-range correction data in RTCM SC-104 format, with message types 1,2, or 9. As
using DGPS receiver with different communication parameters, GM-83 may decode the data correctly to
generate accurate messages and save them in battery-back SRAM for later computing.
Table 4-10 VTG Data Format
Example Units
$GPVTG
309.62 degrees Measured heading
T
degrees Measured heading
M
0.13 knots
N
0.2 km/hr
K
*6E
Table C-9 MSS Data Format
Example Units
$GPMSS MSS
55 dB
27 dB
318.0 kHz
100
Description
VTG protocol header
True
Magnetic
(1)
Measured horizontal speed
Knots
Measured horizontal speed
Kilometers per hour
End of message termination
Description
protocol header
dB SS of tracked frequency
SNR of tracked frequency
Currently tracked frequency
100 bits per second
11