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Horse band (HAS-40)
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Extention pipe (2273 pipe)
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DGPS receiver
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INSTRUCTION MANUAL
DIFFERENTIAL GPS BEACON RECEIVER
RD-200
Thank you for purchasing the
RD-200 DIFFEREN-
TIAL GPS BEACON RECEIVER
. Connecting this
DPGS beacon receiver to the Icom navigation sys-
tems, will permit the GPS to pinpoint the ship loca-
tion more accurately. Please read these instructions
thoroughly before installing and operating the RD-
200.
SUPPLIED ACCESSORIES
The Differential GPS (DGPS) is a system where the GPS po-
sitioning precision is advanced, and can be utilized efficiently
for coastal maneuvers or other times where high precision
positioning is vital. In order for the DGPS to be put into prac-
tice, a reference station has to be established in close prox-
imity, and a Differential responding GPS ship navigation
system (sold separately) is to be installed.
The reference station (generally a radio beacon station al-
ready established) may assign true or arbitrary position read-
ings due to false calculations of coordinates received from
the GPS receiver and coordinates that have been previously
received at the reference station. In this case, correct posi-
tional data is produced and this data (RTCM SC-104) is sent
out from the beacon transmitter.
For the operators, the position correction data is received at
the Differential GPS beacon receiver and then transferred to
the ship’s navigation system. By receiving this new and cor-
rect positioning data the ship’s GPS navigation system will
not only decrease the number of accidental errors, but will
also improve the positioning precision.
With the reference station and the remote receiver in close
proximity precision is at a high level, but by increasing this
distance the error count will increase. For the DGPS to coor-
dinate correctly a distance of 100 to 200 miles is the most
accurate range limit.
(In reference with RTCM: Radio Technology
Commission for Maritime Services).
WHAT IS DIFFERENTIAL GPS ?
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e
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GPS Receiver
DGPS beacon
station
Position
corrections
Reference
station
GPS receiver
Beacon
receiver
Satellite
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