2.1.2 Control Unit
The control units must be mounted close to the
steering stations and are designed for above or
below deck installation.
Position them where they are:-
• Reasonably well protected from physical
damage.
• At least 230mm (9in) from a compass.
• At least 500mm (20in) from radio receiving
equipment.
• Accessible from behind to secure in place and
run cables.
Note: The back cover is designed to breath
through a duct in the cable boss to prevent
moisture accumulation. Direct exposure of the
rear of the control unit to water must be avoided.
Mounting Procedure (Fig. 6)
The mounting surface must be smooth and flat.
Use the template provided to mark the centres of
the two fixing holes and central boss.
Note: Adjacent instruments should have a 6mm
(1/4in) separation to allow room for the protective
covers.
• Drill to 4mm (5/32in) diameter.
• Use 50mm (2in) diameter cutter to drill the
hole for the central boss 1.
• Screw the two fixing studs 2 into the back
cover.
Pass the cable tails through the central hole and
secure the instrument with the thumb nuts
provided 3. (A sealing gasket 4 is already
attached to the back cover).
2.1.3 Fluxgate Compass
The fluxgate compass may be attached to a
convenient vertical surface using the self tapping
screws provided (Fig. 7).
Correct positioning of the fluxgate is crucial if
ultimate performance from the autopilot installation
is to be achieved. The fluxgate should ideally be
positioned as near as possible to the pitch and roll
centre of the vessel in order to gimbal disturbance
(Fig. 8).
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