SECTION 2.0 INSTALLATION PLANNING
Alpha Marine Systems autopilots are of a desirably modular design providing great
installation flexibility. The installation should be planned so that the various units will be
located within the vessel for optimum operational ease. Each unit, however, has its own
installation limitations.
COMPASS UNIT
The Compass Unit is a linear flux-sensing type and thus responsive to magnetic fields.
As with all magnetic compasses it should be located at least three feet from any other
compass, as they will influence each other. In addition, the Compass Unit should not be
mounted in close proximity to any large magnetic steel or iron object or to current
carrying wires, as these produce local magnetic fields that may alter the course output
signal. The Compass Sensor should be mounted low in the boat and about mid-way
between Bow and Stern to prevent acceleration errors. Additionally, the Compass Unit
should be mounted as nearly vertical as possible with the connector facing upwards. It
should be mounted in its mounting bracket and attached to a sturdy support with non-
magnetic screws or bolts.
The Compass Unit is internally gimbaled and allows up to forty-five degrees of heel. If
greater angles are anticipated, it is suggested that an external gimbal be used.
* * CAUTION * *
The Compass is liquid-filled and therefore must not be opened, nor should holes be
drilled in the case.
DO NOT try to rotate the black can relative to the top as seals may be damaged.
CONTROL UNIT
The Control Unit has been constructed of the finest quality components and has sealed
controls to prevent moisture intrusion. Flush mounted units must be caulked to the
mounting surface and tested for leakage. Trunnion mounted units must be mounted
below decks out of the direct weather, as with all premium electronics such as radios.
The trunnion-mounted units have been provided with a mounting bracket, which may be
utilized either by itself or in conjunction with custom fabricated brackets.
WARNING: In no case may additional holes be drilled in the Control Unit case and only
the four existing screws supplied or 10/32 screws not exceeding 1/2" in length may be
used for trunnion mounting the Control Unit. The mounting bracket may be drilled to suit
the installation.
* * CAUTION * *
The Control Unit has heat-dissipating components and MUST be mounted with adequate
ventilation. It must not be mounted in a compartment with other sources of extreme heat
such as engine compartments, as loss of operation or damage may result.
