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ComNav Admiral P3 Installation & Operation Installation
Document PN 29010075 V3.1 - 41 -
Compasses
The ComNav Admiral P3 is usually supplied with either a ComNav’s Fluxgate Compass
(optionally with a Heading Rate Stabilizer), a 45° Compass Transducer, or a Magnetic
Compass Sensor (for use with an externally-gimballed traditional magnetic compass).
System packages with the ComNav Vector G2 (or G2B) GPS Compass are also available.
The choice of compass depends on the type and intended use of the vessel. Refer to the
appropriate section below for installation instructions for your magnetic compass.
If you have a Vector G2 or G2B Compass (or other NMEA Compass),
please refer to the Installation & Operation Manual that came with it.
When first installed, most magnetic compasses will have Deviation. Deviation is the error
between the compass reading and the vessel’s actual Magnetic heading. Deviation is a
result of magnetic fields induced in the vessel’s hull (on steel vessels), and fields from objects
such as engines, davits, galley equipment, etc., and electrical/electronic systems & wiring.
If you have a ComNav Fluxgate Compass (with or without HRS) or a 45° Compass
Transducer, the Admiral P3 can electronically compensate for the Deviation. The
compensation procedure is done during the Sea Trials. If you have a magnetic compass, it
will have to be manually compensated. A professional compass adjuster often does this job.
If you intend to use a fluxgate compass other than a ComNav Fluxgate Compass, or if you
are using a magnetic compass not supplied by ComNav, you should contact the dealer you
purchased it from, or the manufacturer, for instructions on how to install and set up your
compass.
Note: Do not permanently install any compasses until sea trials are
complete. Depending on the outcome of the sea trials, it may be
necessary to relocate the compass(es).
ComNav Fluxgate Compass
Mounting
Choose a location for the Fluxgate Compass. For best performance, the Fluxgate Compass
must be mounted as close as possible to the vessel’s center of pitch and roll. This is typically
low in the vessel, at or about the waterline, and slightly aft of the center of the vessel.
You must keep the compass as far away as possible – at least 2 metres (about 6’) – from
engines, electric motors, and other magnetic objects.
Holes are provided to attach the Fluxgate Compass to either a bulkhead or to a horizontal
shelf or deck. The compass must be mounted parallel to, and as close as possible to the
centerline. The compass must be mounted with the correct side up (that is, with the cable
coming out of the top of the unit). The arrow labelled “BOW” should point forward.
Electrical Connection
Route the Fluxgate Compass cable from the Fluxgate Compass to the location where the
SPU will be. Avoid running the cable parallel to antenna cables, AC power, or DC
wires/cables carrying heavy current.
Excess cable should be coiled up; ComNav recommends that the cable NOT be shortened.
If the cable is too short, plug-in Compass Extension Cables are available in various lengths
from your ComNav Dealer. Cutting and splicing the Fluxgate Compass cable is NOT
recommended.
See Compasses on page 52 for further details on connecting the Fluxgate Compass cable to
the SPU.
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