Rtcm Received Data; Earth Datums - Holux GM-210 User Manual

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.

5.2 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-210 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-210 may decode the data correctly to generate
accurate messages and save them in battery-back SRAM for later computing.

6. Earth Datums

6.1 Earth Datums
The following is a list of the GM-210 earth datum index and the corresponding earth datum name:
Item
1 Adindan - Ethiopia
2 Afgooye – Somalia
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
Datum
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
Reference Ellipsoid
Clarke 1880
Krassovsky
HOLUX
Data name
Data1.dat
Data2.dat
11