Quandary
Well-known member
That makes your symptoms identical to mine, fitted in 2007, perhaps they had a batch of faulty chips. The only good news I can report is that mine has functioned OK since they repaired it.
Raymarine pilot: sudden sharp turn
- Thread starter Roberto
- Start date
That makes your symptoms identical to mine, fitted in 2007, perhaps they had a batch of faulty chips. The only good news I can report is that mine has functioned OK since they repaired it.
Martin_J
Well-known member
Still intrigued... However much noise there is on NMEA, I would not have thought that any sentence could cause the unit to switch on..> Perhaps noise on the seatalk could create an 'on' message but we'd need to know more about the Seatalk sentences.
If you could switch the override funciton on/off via seatalk - would the unit beep?
Could the unit have a faulty button and it effectively shorting and the unit thinking the button has been pressed? Is it one button press to switch between override and back again? If the beeps only occur upon button presses then perhaps it is the switch unit and not the computer...
If you could switch the override funciton on/off via seatalk - would the unit beep?
Could the unit have a faulty button and it effectively shorting and the unit thinking the button has been pressed? Is it one button press to switch between override and back again? If the beeps only occur upon button presses then perhaps it is the switch unit and not the computer...
Martin_J
Well-known member
Quandary - Did your display show 'Overdrive' as it beeped and took control?
webcraft
Well-known member
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I believe tcm has experienced the same thing on Mojomo when they put the kettle on.
- W
I believe tcm has experienced the same thing on Mojomo when they put the kettle on.
- W
Quandary
Well-known member
My recollection is that it displayed different numbers with every beep which had nothing to do with the compass heading. I do not recall seeing 'Overdrive'. It beeped slowly but repeatedly as it does when showing an 'off course' error.
I tried the full calibration procedure several times and tried reducing the sensitivity etc. but this made no difference.
syfuga
Member
Crash turns possible solution
On older course computers, there was apparently a problem sounding like yours, associated with the absence of a joystick controller. The fix, according the to the Raymariine chap I have been consulting, is to put a 10K resistor across grey and blue of the joystick connection.
On older course computers, there was apparently a problem sounding like yours, associated with the absence of a joystick controller. The fix, according the to the Raymariine chap I have been consulting, is to put a 10K resistor across grey and blue of the joystick connection.
Quandary
Well-known member
Update,----- the bleeep bleeep thing is misbehaving again this summer. Intermittently( it works fine for hours some days) the display stops showing the correct course and steers of course. The info on the display last time was xte followed by two rows of dashes, most time it just shows a different course from that set and occasionally it says 'no data'. I have checked all the connections and reprogrammed half a dozen times.
Because Raymarine take so long to carry out repairs in summer nowadays and it usually still works long enough for sail changes etc. to be carried out I am not sending it back until autumn but I emailed the dealer to register the fault on the anniversary of the repair.
mcanderson
Well-known member
Rudder transducer?
Could your rudder transducer be failing? Mine went at the beginning of last season and I noticed as the linear rudder angle display showed nothing and the result was the autopilot throwing the rudder over to full deflection as it tried to correct. £140 ish for a new transducer and about an hour to fix. Since then back to perfect operation.
Could your rudder transducer be failing? Mine went at the beginning of last season and I noticed as the linear rudder angle display showed nothing and the result was the autopilot throwing the rudder over to full deflection as it tried to correct. £140 ish for a new transducer and about an hour to fix. Since then back to perfect operation.
greenalien
New member
I have an ST4000, and have occasionally had a similar problem. However, I think I may have cracked my problem today, because the problem repeated itself in the same location - in the Solent, just off Lepe, where there are a lot of on-shore posts with yellow triangle and diamond topmarks - i.e. where the mains power cables run from the mainland to the IOW. I also had a similar glitch just south of the Fawley tanker jetty, where I know there's an underwater cable tunnel across Southampton Water from Fawley power station to Hamble.
So, no doubt in my mind, under water power cables cause a local magnetic anomaly that confuses the compass sender. If you get a similar problem, it would be interesting to know exactly where it happened.
So, no doubt in my mind, under water power cables cause a local magnetic anomaly that confuses the compass sender. If you get a similar problem, it would be interesting to know exactly where it happened.
DaveS
Well-known member
I would seriously doubt that a sub-sea power cable could cause a measurable magnetic anomaly at the surface. Whether AC or DC the aggregate current within the cable as a whole at any instant is zero so at any sensible distance from the cable there can be no magnetic field created by it. (Very close to (a few mm from) the cable, where the separation distance between its conductors is significant relative to the distance to the measurement point, a small field will be detected, but this is hardly relevant.)
greenalien
New member
Well, it's an odd coincidence that the 'glitch' happened on 2 different days, in the same place, and the power lines are certainly there, and I was only crossing them with a couple of metres of water under the keel. Unfortunately, I don't carry a magnetic field strength detector on board! Given that the earth's magnetic field is very weak, and the fluxgate sensor is very sensitive, I'm not ruling anything out yet!
DaveS
Well-known member
You probably do! Did you see any deflection on your compass?
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ffiill
Active member
When it comes to switching the power on are there any electromechanical relays involved to switch in the full load?
My ancient Sharps aotopilot uses these once the circuitry has done its switching bit.
Due to useage a small blip of contact material had built up on one side of contacts and corresponding little hollow on other side(this often usedto happen on car ignition contacts)
Result contacts "stick" together and boat does an extreme right or left.
Replace relay and problem solved.
My ancient Sharps aotopilot uses these once the circuitry has done its switching bit.
Due to useage a small blip of contact material had built up on one side of contacts and corresponding little hollow on other side(this often usedto happen on car ignition contacts)
Result contacts "stick" together and boat does an extreme right or left.
Replace relay and problem solved.
Stu Jackson
New member
WE have underwater automobile tubes here that drift our ST3000 off course, but only about 10 degrees and once clear the helm comes right back.
Based on the difference in scale, I would doubt if cables could do that unless they're very big and very shallow.
BUT, if the DO repeat the issue, then perhaps.
We also have railroad tubes, but they're much deeper than the auto tubes and do not affect our AP.
alphonsus
New member
Compass needles/cards are a lot heavier than the electrons in a fluxgate compass so the boat's compass may not have shown any deflection in the time taken to pass through the zone of magnetic interference while still confusing the autopilot. I suspect however that you have an intermittent loose connection in the cabling, or a dry solder joint in the electronics. Have you noticed any correspondence with extremes of temperature?