Course heading disagreement

[CaspersCruiser]

Another chartplotter issue calibrating your autopilot compass will solve, if you have radar, is the radar overlay on the chartplotter map will be closely aligned. If you try overlaying radar on the chart with your current autopilot heading situation, it will be slewed off the same 25 degrees.

 

[Submariner]

I do have radar and I also have that problem!! I try and stay far away from others when cruising, so it’s not as pressing of an issue. But now that you mention it, i can definitely relate.

It’s the difference between “heads up” and “course up”.

Heads up, boat is heading up, course is 25 degrees to the right... as opposed to course up, where the boat is pointing 25 degrees to the left and looks like it’s moving sideways. And the radar overlays on top.

Do you know what the radar uses for it’s bearing?


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[Trisailor]

when I first purchased my R27, the autopilot heading and compass disagreed by 180 degrees. Turns something had impacted the bracket in the cave allowing the CCU to drop out of the bracket. After replacing the CCU in the bracket i had to rotate it until the autopilot heading and compass read the same, then ran the wizard dockside. Both have matched up ever since. Considered swinging the compass, but haven't dredged up the energy to go through that effort since it seems pretty close for the area I'm in.

 

[Submariner]

Running through the compass calibration and the north calibration for the compass worked.

GPS heading, magnetic compass and auto pilot compass are all close enough for government work.

And as far as my radar, objects appear about where they are at now. 🙂

Thanks to everybody for all the input.


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