Hello all, I'm still very unsure about the magnetic compass errors. Mainly the Northerly Turning Error and the Acceleration Error. I been researching on them on google, and I still don't understand what they mean! If someone is free, please post a very simplified and easy to understand guide about the errors.

From what I know about Northerly Turning Error, If the plane is heading to the North, If you make a turn to East or West, there will be something wrong with the Magnetic Compass? What is it..?

Then for the Acceleration Error, If the plane were to accelerate to East or West, the magnetic compass will show a false turn to the North but if the plane decelerates, it will show a false turn to the South. But how does the magnetic compass even do that ? Thanks a lot!

Hope someone can clarify..