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Instruction manual
5 Appendix
5.1 Advice On Operation
The Simrad Wheelpilot, when used correctly, can maintain as good a course, on most points of sail
as a skilled helmsman, with the advantage that they never lose concentration where a human may
begin to show lapses of concentration after as little as ten minutes.
There are certain circumstances, however, where a human pilot has the advantage in being able to
anticipate events which no autopilot can sense, typically in a heavy following sea. The
following advice should improve efficiency when sailing using Wheelpilot:
1. When sailing close to the wind, it is easy to forget to trim the mainsail, allowing excessive weather helm to build up. Where a human helmsman would quickly complain, the autopilot will struggle on, and the boat will be sailed less efficiently. Whereas a human normally likes to feel some
weather helm, this is not necessary for the functioning of the Wheelpilot. Power consumption,
wear and drag will be greatly reduced, if the mainsail is freed or reefed a little sooner than normal
when sailing manually.
2. It is also advisable when sailing close hauled to set a course a few degrees free of that normally
sailed under manual control, to avoid luffing into the wind.
3. When running dead downwind, a human pilot can see visual signs warning him if the boat is
about to gybe, which the Wheelpilot cannot sense. Therefore, when under autopilot, it is advisable
not to sail as close to the gybe as you may do when sailing manually.
4. When broad reaching or running fast, particularly with quartering waves, a helmsman will
naturally apply periodic larger angles of helm than when beating or sailing slowly. This is the
equivalent of increasing rudder Gain, and it may be a good idea to adjust the Gain on the
Wheelpilot. Many people prefer to find a compromise setting which is used for all sailing, but with
practice it can be optimised for different conditions, e.g. low for motoring in a calm sea or high for
running fast. If the Gain is set too low, the boat will yaw because insufficient rudder is applied in
time; if the Gain is too high, the boat will continually overcorrect on each deviation, increasing
power consumption.
5. While the clutch is engaged, the wheel cannot be turned manually. In an emergency situation,
manual control can only be achieved by lifting the clutch lever. Do not attempt to force the wheel
while the clutch is engaged as you may damage the Wheelpilot or break the internal drive belt.
6. The Wheelpilot is a highly advanced piece of equipment – as such, it is a valuable aid to enjoyable sailing. However, it would be a mistake to become complacent. As with all electronic navigational equipment, it is an aid to navigation and should not be used as a substitute for conventional navigational practice. Remember – Maritime Law* requires that you keep a good look out at
all times.
*IMO International Regulations for Preventing Collisions at Sea, Part B Rule 5 (1972)