Sorry for the length if this but when hand steering
you avectime to type....
We have a full raymarine
kit on board our lagoon 440
. Currently in Belize
. Currently hand steering
. Any help will result in us ( and you if you are near) being very drunk and swearing to tell our AP we love it every day.....
1. Control head
. - ST 6002. Purchased November 2012 in Gibralter.
Computer - X3(?) purchased January 2013 in St Martin
. Installed and calibrated in St Maartin by an authorised Raymarine
2. All working fine January 2013 until December 2013 - approximately 2500 nm completed in that time.
3. Left Panama
December 20, 2013. Noticed a difference of approximately 30 degrees between control head
reading and ships compass/ stand alone Raymarine MFD COG reading. We then noticed that this difference decreased and increased at times. Inconsistent. HOWEVER, when the autopilot
was engaged it still functioned properly. Eg held course, held course to wind
, tacked, and the control head heading reading, although incorrect , was fairly consistent.
4. 1st March 2013. Left anchorage and engaged autopilot
Autopilot unable to hold course, usually veering to port, and completing 360 degree turns if left to steer the boat. Autopilot disengaged and re-engaged a number of times. Same result.
5. 3rd march. Attempted to recalibrate via sea trial calibration. First step - swinging the compass
. Performed approximately 15 clockwise turns in calm seas and up to 15 knots breeze. Unable to receive a deviation reading.
6. 4 th March. Again attempted to recalibrate via sea trial calibration in very clam water
and 3 kn breeze. Completed 10 turns each of which took approximately 2 minutes 30 seconds. Unable to receive a deviation reading.
We then identified the existing deviation reading of 4 degrees, and decided to move onto the next step in the sea trial calibration - heading alignment. When we reached the heading alignment screen
on the control head, the reading constantly rolled around and was at times 180 degrees or more wrong. We used the +1, +10 , -1,-10 buttons to save an accurate alignment.
We decided not to perform the rudder
alignment step of the sea trial and progressed to autolearning. The boat performed 10 manouevres under the autolearning phase and we received a ' pass ' reading at the end. During the autolearn process, the boat turned to starboard for a short time and then executed 2 x 360 degree turns to starboard. It then immediately went into 2x 360 turn to port. It then tracked out and executed 2 or 3 zig zag turns.
We then engaged the autopilot, but it continued to not work.
The main issues are;
- unable to hold a course. Whenever we engage the autopilot it veers violently to port ( usually port, but occasionally starboard) and if left to its own devices, will execute 360 degree turns. The control head will alarm
'off course' after we have turned through 90 degrees, but the autohelm
will continues to complete the turn. If we then try to correct by requesting it turn to starboard, we need to request a turn of at least 100 degrees before it will even start to turn to starboard. Similarly, if we are eventually able to get the autohelm
to turn to starboard, it is very difficult to then get it to turn back to port. Ie we need to request a turn of 100 degrees to port in order to effect a change in direction.
- Control head reading is grossly inaccurate and changes constantly even if we hold a constant course in standby mode. We have tried a number of times to perform the ' heading alignment ' step in the sea trial calibration, but the control head is unable to maintain the correct heading.