ENGLISH
9
It is very unusual to obtain an absolute compensation of a boat compass. It is extremely difficult, if not
impossible, to get a compass to show a precise reading in all directions. This is because there are a lot of
things that can interfere with a compass, e.g. magnetic fields, metal, and electrical systems. When
adjustment has been completed, it is a good idea to compile a deviation table as a navigational aid.
Use a sea chart of the area and plot a series of bearings on the basis of known visible markings. Ideally
these should be within a 15 degree interval. Move towards the markings and note the compass bearings.
Mark the exact deviation in degrees and bearing for each marking. Double check.
The compensator should be checked at the start of each season to ensure that the boat’s magnetic field
has not changed. Also check whenever the equipment on board has been changed, or if the engine has
been repaired.
Lighting
The compass is fitted with a 12 volt bulb at the factory. The two wires from the bulb can be connected to a
switch on the boat’s control panel. The compass light can be connected to a rheostat to adjust the
brightness. When the light is connected, twist the wires around each other to prevent them emitting a
magnetic field. The switch and rheostat must be placed at least 300 mm from the compass.
MAINTENANCE
If the compass is used at sea, wipe off any seawater from the compass every time it is used. Otherwise,
wipe the compass at regular intervals with a clean and lightly moistened cloth. If the compass is not going
to be used for a long period, e.g. when the season is over, it should be removed from the boat and stored
at room temperature.
Low temperatures can cause a small bubble to develop in the upper part of the compass. This bubble will
not affect the function of the compass, and will normally disappear when the temperature rises.
Subject to printing errors and design changes over which we have no control. In the event of problems,
please contact our service department.
www.jula.com
