Autopilot Woes On Young 45

Canyondiver

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Working on integrating a Garmin GHC 20 into a new Garmin suite.

Boat had a Robertson AP setup.

Steering is Hydroslave dual piston quadrant.

Builder feels the Garmin is not commercial duty enough, for the barn door rudder.

Thoughts?
 

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The Garmin Mechanical/Solenoid/Retrofit core pack will do the job; with that Hydroslave steering it's not actually the pilot doing the heavy lifting/turning of the rudder, it's just opening solenoid valves off the power steering. You will need to make sure to get that specific pack, plus a GRF10 rudder feedback and the 15m extension. It's not my favorite pilot, but it'll do the job.
 

Canyondiver

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Have GRF 10, GHC 20 head ECU 12, and Reactor 40 heading sensor.

Icon tracks in reverse…

Do compass cal and North cal, icon flips around the right way.

Run through Sea Wizard, and she fails Zig Zag.
 

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have you had to redo the compass calibration each time out, not holding the cal?

and in the dockside, has it passed the rudder calibration? Lastly, what's the bypass voltage of the solenoid valve?
 

Canyondiver

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Yes to the first two, voltage has not yet been checked by me.

Im following up on another tech’s install.
 

southshore30

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Wharf Rat

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You should not have to keep calibrating the heading sensor; it's possible that it's mounted too close to something ferrous, high current cable, but if not, that'll most likely have to be RMAd back to Garmin. Double check the voltage for those solenoids, very possible they're 24V.
 

Canyondiver

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Thanks guys!
Thought that might be 24VDC.

Is there a voltage doubler in the ECU?

Heading sensor is almost dead amid ship.
Going to extend cabling, and move to master stateroom.

No electrics near there, as well as bigger swing may help recognition of directional changes
 

Canyondiver

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Tried a bunch of things so far, higher flow rates for fluid, bleeding steering, moving heading sensor around to low, waterline height, and moving forward another foot or so.
On cabin overhead the magnetic environment numbers are in the high 80s, Spin Quality is under 50.

Down low, mag environ is 66, spin is 78.

Won’t hold heading, fails miserably if I “go to” a waypoint.

Swings towards, and keeps on turning.

Like rudder is stuck, which it’s not.

Ugh!
 

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Ugh is right.. Honestly not sure what else I could recommend.. Magnetic Env. of 66 isn't ideal but I've seen plenty of those pilots function at 60-70.. You could try just a temporary spin with the CCU on a milk crate where there's nothing magnetic nearby and see if it changes anything.. that said, after you do the calibration spin, how accurate is the heading before doing the 'set north' or fine tune?
 

Canyondiver

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Accuracy after spin has the icon running in reverse.

Dial heading in with Compass Fine Tune.
 

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Yeah, that's definitely not right. It should be relatively close to your actual heading, 180 degrees out is NG. I would take that thing, put it somewhere like on milk crate or cardboard box to lift it up off the cabin sole up and away from any possible magnetic interference; you really want to be 3 feet away from anything ferrous. These days you can just use a compass app on your phone that can display magnetic field in Gauss or MicroTesla; I use 'Teslameter 11th' but 'Compass X' app will also work and show you microtesla value in the center of the compass rose. Make sure you turn on all your other systems as a high current carrying cable will produce an EMI field just like a magnet.

Once you find an area with a decent field (less than 70uT Micro-Tesla or .7 Gauss/ 700mG Milligauss), do a compass swing and see where you end up. Hopefully the spin quality will be in the same range, but if you still see some screwed up heading and a magnetic environment that doesn't improve, then the CCU is probably at fault and you'll have to call Garmin with the SN to get it RMAd. Sorry you've had to deal with all this shit, but hopefully it's something ferrous or EMI that's causing that heading flux.
 

Canyondiver

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Thanks Wharf Rat!
This is where I was heading, no pun intended.

The apps you mentioned will be useful, as the freebie I have is really annoying

will give that a go probably Sat afternoon when we have water.
 

Canyondiver

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50ut everywhere in the area, all electronics running, and engine
 

Dave588

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I dont see how heading could be off 180 degrees. The heading sensor in box placed upside down shouldnt do that.
 

Canyondiver

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I dont see how heading could be off 180 degrees. The heading sensor in box placed upside down shouldnt do that.
It should not, but the icon flips 180 if you run full auto calibration.

Manual cal seems to be where it’s going to get working right…

I hope!
 

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