Rtcm Received Data; Earth Datums - Holux GR-211 User Manual

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 GR-211 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, GR-211 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 GR-211 earth datum index and the corresponding earth datum name:
Item
1 Adindan - Ethiopia
2 Afgooye – Somalia
3 Alaska, Conus – North American 1983
4 Albania – S-42 (Pulkovo 1942)
5 Argentina
6 Australia
7 Bahrain – Ain el ABD 1970
8 Bangladesh
9 Bolivia
10 Botswana – ARC 1950
11 Brazil
12 Brunel, East Malaysia
13 Canada – North American 1983
14 Chile
15 Colombia
16 Colombia – Provisional American 1956
17 Czechoslovakia – S-42 (Pulkovo 1942)
18 Ecuador
19 European 1950 – Central Regional Mean
20 European 1950 – Cyprus
Example Units
$GPVTG
309.62 degrees
T
degrees
M
0.13 knots
N
0.2 km/hr
K
*6E
Datum
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
GRS 1980
Krassovsky 1940
South American 1969
Australian – National
International
Everest 1830
South American 1969
Clarke 1880
South American 1969
Everest (Sabah & Sarawak)
GRS 1980
South American 1969
South American 1969
International
Krassovsky 1940
South American 1969
International
International
HOLUX
Data name
Data1.dat
Data2.dat
Data3.dat
Data63.dat
Data4.dat
Data70.dat
Data5.dat
Data6.dat
Data8.dat
Data7.dat
Data9.dat
Data37.dat
Data10.dat
Data13.dat
Data12.dat
Data11.dat
Data64.dat
Data14.dat
Data29.dat
Data15.dat
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