My Navico fluxgate compass was flooded a year ago and I've tried in vain to find a replacement for my Corus heading /autopilot. Is there a substitute that uses this old NMEA ?

The "Error Rudder" message on the C600AD display could indicate an issue with the linear feedback unit (LFU) or the rudder angle sensor. The LFU measures the position of the rudder and sends that information to the autopilot control unit.
You may want to check the wiring and connections between the LFU and the autopilot control unit to ensure that there are no loose or damaged connections. If the wiring is intact, the LFU may need to be replaced or recalibrated.
You may also want to check the rudder angle sensor to ensure that it is functioning properly. If the rudder angle sensor is not providing accurate information to the LFU, it could cause the "Error Rudder" message.
It may be helpful to consult with a marine electronics technician or the manufacturer of the C600AD autopilot system for further troubleshooting and repair recommendations.

Contact Navico directly to request the manual.

ou will need professional repair services to work on the fluxgate compass.

First of all - is the boat compass correct? How does it align with COG? Secondly, do you have a magnetic field that interfere with the fluxgate? To test for this you can use the compass on your smartphone or a handheld compass, move about in the boat and keep the phone/compass aligned with the keel. If the heading drifts in the area where you have your fluxgate today, move it.

If I were troubleshooting this, I'd manually adjust the orientation of the compass sensor until it matched the true heading. Once that was done, I'd move it side to side to ensure it's changing in the correct directions. If not, the unit could be upside down. Let me know how this turns out.

compass needles are affected by iron objects and can also be affected by field magnetism generated by current flowing through a wire .Bilge pumps , winch motors are heavy current drawers and they could affect the compass operation
while the voltage is low the field of the magnetism around the wire can influence the compass heading so check for any electronic apparatus wiring close to the unit ( radio , radar etc
it may be necessary to run the powers wires in an insulated sheath ( like coaxial cable or other insulated power cables) around sensitive equipment
talk with marine equipment installers to get better ideas as to prevent interference with the compass

Were you able to get your TP20 repaired? I service these units in addition to the Navico Corus instruments and pilots. I also buy and sell units to help owners keeps their systems functional.

Tom LaMers
[email protected]

The direction of the boat symbol is depending on the compass course from the autopilot. You will see that your GPS course (COG) and magnetig heading on the autopilot differs. Solution is to calibrate autopilot compass. Will advice you to not use course up, stick to north up or heading up.

You have two things that orient the radar, on is called heading (or bearing) alignment. This is where you aim your radar so that a target comes up at 12 o'clock when dead ahead. Access this mode by pressing and holding menu duing power on, and go in to Installation Mode, radar setup, next page, align heading. I have posted a "tip" on this, search for VX2 radar alignment.
After this is done, North up is accomplished by having a magnetic input (fluxgate compass or autopilot). Calibration of this compass varies, but if it is accurate, then all should line up nicely.

Try to borrow a computer unit to detect if the fault is in the computer unit or the display unit