Radar calibration

[efanost]

Hello clever people,

I switched on, for the first time on my new-to-me boat, the radar. I noticed that there is a huge offset between the radar overlayed image, and the chart and AIS targets.

If you see the picture attached, the radar image seems consistently off the charted coastline, the charted wind turbines and the AIS target.

Should I just need to go and read the manual to figure out how to re-calibrate my radar? Maybe that's the simple answer, but I'd be surprised that the previous owner has not done anything about it. Or could it be something else that affects the accuracy of the overlay?

Thanks!