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Road Work Ahead

Hello,

I own a 2nd hand boat that is equipped with the AP5000+ unit. I am obviously having problems with it and hope I can get some help here.

At slow speeds-

Unit will work fine heading east with some deviation north and south and then all of a sudden it will go of course and continue to turn of course. When heading west I cannot 50' without the boat heading of course. The heading value on the display does not change and the rudder indicator also shows on the display.

At high speeds-

The boat will stay on course for a short time but will then head off into a turn. It will also make slight S turns if staying on course.

The previous owner had a Northstar 952x Chartplotter on board and I think that the AP5000 is tied into the Northstar unit in some way. The previous owner doesn't remember much.

Could you tie the AP into a Northstar unit?
I cant find a fluxgate compass on the boat, can the AP5000 run without one?
What else should I be looking for?