STOWE MARINE DATALINE-X COMPASS, User Manual

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Installation Part 3
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Depth sounders, etc.
TWO
metres from:
Engines / electric motors
Large masses of soft iron, e.g., keels
THREE
metres from:
Radar magnetrons.
It is possible to use a small hand-held magnetic compass to check the
mounting location. Move the compass in a horizontal circle of approximately
30 cm (1 ft) radius around the desired mounting location. Be sure that the
lubber line is parallel to the midships line, and observe any heading - change
from the first noted reading. Not more than 50 deflection should be observed.
Repeat the same circle test, this time in a vertical circle. Little or no compass
card deflection should be observed. This check should be done with any nearby
equipment powered, and cables carrying their normal current.
The Dataline Heading sensor requires a mounting surface which is vertical,
and facing forwards. The RFC250 sensor requires a horizontal mounting
surface.
Figure 3.1 - Installation