Appendix E: Connecting A Raytheon St80 Active Compass For Marpa; Course Computer - Raytheon R80 Owner's Handbook Manual

Appendix E: Connecting a Raytheon Active Compass
Appendix E:
Connecting A Raytheon ST80 Active Compass for MARPA

Course Computer

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The performance of MARPA on the 10" CRT radar display is dependent on the
quality of your heading sensor and such data must be provided on NMEA.
If you have an ST80 active (fluxgate) compass as part of an existing system on
SeaTalk, you should do the following when connecting it to your 10" CRT
display:
• Rewire the compass to provide heading data on NMEA.
• Calibrate the compass manually; it is not possible to calibrate the compass
via the autopilot or ST80 system.
Note: If you are using a suitable third party, NMEA heading sensor refer to its
documentation for installation and calibration details. Connect such a compass
in a similar manner to the ST80 active compass, giving due consideration to the
power requirements.
The following sections provide configuration and connection details for three
typical Raytheon systems:
1. A course computer (software version 11 or above) on SeaTalk with an
ST80 active compass (which could be part of an ST80 system).
2. An ST4000 or 5000 autopilot and an ST80 active compass.
3. An ST80 system including an active compass, without a course computer.
If you require further assistance please contact your authorised Raytheon
dealer.
If you have a Raytheon course computer and active compass we recommend
that you configure your system as follows:
• Disconnect any compass directly connected to the course computer.
• Ensure the active compass is re-wired to provide heading data on NMEA.
• Power the active compass from the course computer.
• Connect the active compass to the NMEA input of the course computer and
to the NMEA input of your CRT display as shown in the following
illustration.
• Set Bridge NMEA Heading OFF in the CRT display System Set Up menu.
• Calibrate the compass in NMEA mode as described in the section
Calibrating the ST80 Active Compass.
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