B&G Network Autopilot - Manual (Page 109)

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Check list:
1. If other displays show Pilot data, check installation of Pilot display or
suspect faulty Pilot display.
2. If no Pilot data on any display, check installation of Pilot computer or
suspect faulty Pilot computer.
3. Check installation of network cable.
NOT STEERING A STRAIGHT COURSE
Fault description:
The Pilot seems unable to steer straight, it continually overcorrects
course errors; the wake has an "S" like appearance as the boat first
steers several degrees off course to port followed by several degrees
off course to starboard.
Check list:
1. Drive unit. Check for any slack or backlash in the drive system, see
earlier section.
2. Rudder reference. Check for any slack or backlash in the assembly
and associated linkages, see earlier section.
3. Boat speed. Check that the boat speed input is operating correctly.
4. Settings. Read the commissioning manual carefully and check that
the settings are appropriate for the type of boat.
5. Rudder gain. Make large course changes using the pilot, if the gain
value is correct the rate of turn should be between 6 and 8 degrees
per second. Adjust if necessary.
6. Boat Lag. A boat lag value which is too small for the boat can cause
instability, try increasing the value.
7. Check location of Compass sensor in vessel. Ensure that the sensor
is not effected by cables carrying heavy current cables,
Loudspeaker magnets or ferrous metals.