Icom RD-200 Instruction Manual

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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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GPS Receiver

DGPS beacon 

station 

Position 

corrections

Reference 

station

GPS receiver

Beacon 

receiver

Satellite

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