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20221370A

 1 

07.06.04

 

 RC37 RATE COMPASS 

INTRODUCTION 

Simrad RC37 Rate Compass is a fluxgate compass with a built in rate sensor that 
significantly improves the dynamic performance of the compass. This makes it an 
excellent heading source for autopilots, chart plotters, radars and other equipment that 
will benefit from the dynamic characteristics of RC37. 
Heading output is on sine/cosine and NMEA0183 formats. 
The technical specifications are printed on page 4. 
The RC37 Rate Compass (part no. 22084446) can be used as a high performance 
heading sensor on the following Simrad or Robertson autopilots: AP45 and AP9MKII – 
Mk3. It replaces the previous RFC35RS and is a high performance alternative to 
RFC35N and RFC35NS. 
RC37 comes with a 15 m (49’) open end cable wired for NMEA0183 input and output. 
The internal connections of the wires are shown on Figure 2. 

Notes ! 

1.

 

Figure 2

 

shows the connections when the compass is used as a stand alone 

NMEA compass. An extra cable gland is supplied for a separate supply 
cable if preferred. Disconnect the grey and pink wires from TB4 and 
connect the separate cable wires instead 

2.

 

For connection to IS15 instruments refer to revision C or later of the IS15 
NMEA manual. 

3.

 

On AP45 and AP9MkII – Mk3 installations you need the compass connector 
kit part no. 22088413. Connect the AMP connector (J2, J5) from the kit as 
per Figure 3. 

INSTALLATION 

The RC37 contains a magnetic fluxgate sensor and great care should be taken when 
deciding the mounting location. 

Figure 1  Mounting 

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