ComNav 1500 / 1510 Autopilot - 13 -
2.4 Flux Gate Compass
Location
Compass location is most critical. This compass operates with an automatic
deviation feature. Best performance will be obtained if mounted at the center of
pitch and roll, in order to minimize undesirable accelerate which can degrade
compass stability. On most vessels this would be about 1/3 forward, on the
centerline and approximately at sea level. Various obstructions or magnetic
interference may exist at this ideal location and a reasonable compromise is
acceptable in establishing the exact location. The fore-aft arrow on the compass
should face forward and parallel to the boat centerline. If this is not possible, the
compass error resulting (lubber line error) may be corrected after Autodeviation has
been performed. The compass should be mounted with the cable outlet at the
bottom (See diagram on following page).
The following safe magnetic distances should be maintained where possible:
OBJECT SAFE DISTANCE
Ft. m.
Main Engine 7 2
Radar Magnetrons 5 1.5
Horizontal and Vertical Steel Plates, Tanks 3 1
High Power Electric Motors (bilge pumps,
refrigerators)
31
HF or VHF Antennas 10 3
High Current DC wires 3 1
Magnetic meter movements and loud speakers 3 1
Large bolts or fasteners 2 0.6
The above may not always be possible to maintain due to problems unique to each
vessel. If in doubt, check for local magnetic disturbance using the Installation
procedure.
Steel vessels are a special case and an experienced compass adjuster should be
consulted since the automatic compass compensation only corrects for horizontal
errors and significant deviation from vertical fields such as Vertical Heeling Error
can occur.
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