Chapter 4: Maintenance & Troubleshooting 61
If it appears that ST70+ is not operating satisfactorily, check the symptoms below to
determine how to resolve the problem:
• Nothing on the display screen – refer to Figure 4-1, Troubleshooting chart 1 .
• Data missing from the display screen – refer to Figure 4-2, Troubleshooting
chart 2 .
• Data on the display screen is garbled – refer to Figure 4-3, Troubleshooting
chart 3 .
• Specific data types are missing or incorrect:
• Check the relevant Transducer and Pod, including the connections between
them and to the system.
• If speed readings are missing or obviously wrong, the speed transducer pad-
dle wheel could be fouled and need cleaning.
Boat turns slowly and takes a
long time to come onto course,
under autopilot control
Rudder gain too low. Complete AutoLearn or increase
gain setting (see
Chapter 3: Setup Information
).
Boat overshoots when turning
onto a new course under
autopilot control
Rudder gain too high. Complete AutoLearn or decrease
gain setting (see
Chapter 3: Setup Information
).
The autopilot ‘hunts’ when
trying to position the rudder
Increase the rudder
damping one level at a time until the
autopilot stops hunting, and always use the lowest
acceptable value. (see
Chapter 3: Setup Informa-
tion
).
Symptom Possible cause/remedy
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