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ComNav Admiral P3 Installation & Operation Installation
Document PN 29010075 V3.1 - 43 -
Locate and mount the compass in a position that minimizes magnetic interference. The
compass should be at least 1 metre [about 3’] away from such equipment as radios, radars,
depth sounders, and engine instruments.
To reduce the possibility of the card ‘tumbling’ in rough weather, mount the compass as close
as practical to the center of pitch and roll. Mounting the compass far forward under a bunk or
similar location is a poor choice for rough weather performance.
Important! It is important to remember that the compass is a vital part of
the autopilot system. Locating it properly, particularly on steel-hulled
vessels, is essential to ensure proper operation of the autopilot. We
strongly recommend that the services of a qualified compass adjuster
be used to select the best installation location and to compensate the
compass properly for deviation, including that caused by heeling error.
Care must be taken not to place compensating magnets too close to the compass, as this will
cause the Compass Sensor, mounted underneath the compass, to read incorrectly. To
correct compass deviation on steel vessels, or on other vessels with magnetic compensating
problems due to interference from adjacent ferrous masses such as an engine block or
winches, the use of a pair of compensating quadrantal spheres is recommended.
Note: the ComNav Magnetic Sensor SHOULD NOT be attached to an internally gimballed
compass (that is, where the compass card is gimballed and the bowl of the compass is not),
as this will result in large errors between the compass and the autopilot. This is because the
compass card does not remain parallel to the sensor when the vessel rolls or pitches.
Mounting
The Sensor can be mounted to the bottom of the compass using the brass screw supplied, or
it may be bonded directly to the compass bowl using a suitable adhesive. The Nylon Washer
should be placed between the Compass Sensor and the bottom of the compass bowl.
When the Sensor mounts to the bottom of the bowl, the magnetic compass may be used as a
steering compass, if desired.
It is also possible to mount the Sensor above the compass. This reduces the possibility of
interference from the compensating magnets, but also reduces the visibility of the compass.
Optimum positioning of the sensor can only be accomplished once the Autopilot system has
been installed and powered up. See the Getting Started chapter of the manual to perform
this procedure.
Electrical Connection
Route the Magnetic Compass Sensor 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.
Ensure that there is sufficient slack in the cable to allow the compass bowl to tilt and rotate
freely in all directions.
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 Magnetic Sensor cable is NOT
recommended.
See Compasses on page 52 for further details on connecting the cable to the SPU.
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