Raymarine Compass Instrument ST40 - Manual (Page 23)

14 ST40 Compass Instrument Owner’s Handbook
The Fluxgate Compass transducer must also be sited:
• At least 0.8 m (2 ft 6 in) away from the vessel's steering compass to
avoid deviation in both compasses.
• On a bulkhead below deck.
Note: On steel vessels the Fluxgate Compass transducer can be
mounted above deck. When mounted above deck, performance may be
impaired due to increased motion.
• To allow reasonable access for installation and servicing.
• Away from any equipment or other installation which may shield
the transducer or otherwise disturb the earth’s magnetic field, e.g.
large ferrous or magnetic items, engines, communications
equipment or cabling.
• On a vertical mounting surface. Where necessary, make up a
suitable nonferrous wedged packing piece to provide the necessary
vertical surface.
Instrument
D4644-2
Instrument dimensions
126 mm (5.0 in)
21 mm
(0.8 in) 17 mm
(0.67 in)
55 mm
(2.2 in) 70 mm
(2.8 in)
30 mm (1.2 in)
minimum cable clearance
ST40
CAUTION:
The presence of moisture at the rear of the instrument could cause
damage either by entering the instrument through the breathing
hole or by coming into contact with the electrical connectors.
Each instrument must be positioned where:
• It is easily read by the helmsman or navigator
• It is protected against physical damage
• It is at least 230 mm (9 in) from a compass
• There is reasonable rear access for installation and servicing
• The rear of the instrument is protected from water.
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