Chapter 5: Installation
49
• To avoid deviation of both compasses, the fluxgate compass should
be installed at least 0.8 m (2.5 ft) away from the steering compass.
• The fluxgate compass must be positioned as far away as possible
from large iron masses, such as the engine and other magnetic
devices, which may cause deviation and reduce the sensitivity of the
sensor.
• If you have any doubts about the magnetic suitability of the chosen
site, the position may be surveyed using a simple hand bearing
compass. The hand bearing compass should be fixed in the chosen
position and the vessel swung through 360°.
• Differences between the hand bearing compass and the main
steering compass should, ideally, not exceed 20° on any heading.
Mounting location for steel-hulled vessels
If you have a steel-hulled vessel and mount the compass in the
conventional location, you will obtain significant deviation due to the
effects of steel on the Earth’s magnetic field.
To minimise this effect, you should raise the compass transducer above
the main deck or wheelhouse. However, the higher above the waterline
you mount the transducer, the more the vessel’s pitch and roll will affect
the compass performance. Recommended mounting positions are
shown in the following diagram.
136_3c05.p65 14/06/99, 10:1749
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