6
INSTALLATION
MASTER COMPASS UNIT
The main consideration with installation lies in selecting a suitable mounting position -this may be
above or below decks. To take maximum advantage of the remote compass sensor, the mounting
position should be chosen with the following points in mind.
(a) FIXED MACHINERY AND FITTINGS
Keep as far as possible from fixed machinery containing iron or steel. Obvious examples are iron
keels, anchors and chain, engines, auxiliary engines and generators, battery chargers, electric motors,
refrigeration equipment, galley stoves conventional compasses and electronic instruments. Also, keep
clear of ship's wiring where heavy current is carried (e.g. navigation light cables).
As a general rule, the distance from a ferrous object should be greater than three times the largest
dimension of that object Magnetic interference is strongly dependent on distance so even small extra
clearances are worth achieving. As most significant fixed gear is generally aft, a forward location is
usually suitable. Make sure that clamp fastenings are non-magnetic
(b) MOVEABLE GEAR
The effect of fixed gear is compensated by the automatic compass calibration, but that of moveable
gear cannot.
Avoid proximity to any locker where items containing iron or steel (e.g. tools, cameras, audio and
video tapes, books with steel ring binders) are stored. Even food cans are significant. Especially avoid
the normal storage positions of iron/steel objects (e.g. recovery magnets, outboard motors,
audio/video playback units including television receivers and loudspeakers). Remember also that all
types of stainless steel are magnetic to a greater or lesser extent e.g. fuel or water tanks. Note that in
case of doubt a simple test is to bring the suspected item close to a compass (Halcyon or
conventional) and note any deviation. All possible orientations should be tried.
(c) SHIP'S MOTION
Despite the relative immunity of the Halcyon to motion, it is advisable to avoid positions at the
extremities of the vessel where motion is violent.
(d) ACCESS
Remember to leave reasonable access to the compass sensor to facilitate compass adjustment where
necessary.
(e) STEEL HULLED VESSELS
Ships with a large steel content in the hull (including ferro-cement hulls) will normally be obliged to
have the Halcyon sensor mounted above decks - a position on main or mizzen mast is satisfactory-
whilst bearing in mind the requirements of (c) above. Normally 4-5 metres (12-16ft) above deck is
adequate.
