AIS and radar targets are out of sync

[lvnmdrm]

Hmmmm!
I think I understand.
My autopilot is a Raymarine EVO400.
I didn't give it a second thought when the AP indicated a course far different from COG displayed on my MFD (supplied, I assume from the AIS/GPS antenna).
I didn't care that the AP was off if I could see my COG.

Now I am beginning to understand how the heading data DOES make a difference.

The boat is in San Diego and I am in Seattle until January.
This will have to be put off until then, but I can see the configuration (and installation) issues I must address when I return.

Thank you,

Dan