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ComNav Admiral P3 Installation & Operation Installation
Document PN 29010075 V3.1 - 42 -
Heading Rate Stabilizer
The HRS is an optional accessory for the ComNav Fluxgate Compass.
Please refer to the All Models information in the Installation Instructions that come with the
HRS, for mounting & electrical wiring information.
See Compasses on page 52 for further details on connecting the HRS cable to the SPU.
45° Compass Transducer
Mounting
Choose a location for the Compass Transducer. For best performance, it should 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 2m (about 6’) away from
engines, electric motors, and other magnetic objects.
Holes are provided to attach the Compass Transducer to a bulkhead. The compass must be
mounted parallel to the centerline. The compass must be mounted with the correct side up
(the label that says “Compass” must be on top), and the arrow should point forward.
Electrical Connection
Route the Compass Transducer cable from the 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. The cable may be shortened if desired to avoid excess
coils. If the cable is too short, additional cable may be ordered from your ComNav Dealer.
See Compasses on page 52 for further details on connecting the cable to the SPU.
Magnetic Compass and Sensor
The ComNav Magnetic Sensor can be mounted to ComNav’s standard Magnetic
Compasses, and also to a wide variety of other brands of externally gimballed compasses.
The advantage of using a Magnetic Compass with a Magnetic Compass Sensor attached to it
is that the Autopilot is sensing the position of the magnets on the compass card rather than
sensing the earth’s magnetic field directly.
Since the card of the compass has physical inertia, it does not react immediately to the
changes in the magnetic field it is immersed in, but only to those changes which persist long
enough to overcome the resistance of the compass card to movement. This means that the
compass is a more stable heading reference than a Fluxgate Compass. The Magnetic
Compass will largely ignore changes in the magnetic field in the plane of the compass card
caused by vessel motion to which the Fluxgate Compass may react.
This is particularly important in high latitudes, (such as Alaska, Labrador or the North Sea),
where the horizontal component of the earth’s magnetic field (which is the portion that the
compass is trying to detect) is very small relative to the magnetic field of the vessel.
The disadvantage of the Magnetic Compass is that in very rough weather with the vessel
going to windward, it is possible for the vessel motion to upset or “tumble” the compass card,
disabling the Autopilot.
Because of the relative insensitivity of the Magnetic Compass to both the earth’s and the
vessel’s vertical magnetic fields (due to its inertia), it is recommended for use at latitudes
higher than 50° (North or South), and for use on steel vessels when optional quadrantal
spheres are included.
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