Applications of Vector Addition

Hi, just wondering if anybody could help me with the following vector word problem.

An airplane is flying at 550 km/h on a heading of 080 degrees. The wind is blowing at 60 km/h from a bearing of 120 degrees.

1) Draw a vector diagram

2) Find the ground velocity of the airplane

I'm not sure if I should be using true bearings or quadrant bearings for the diagram, and every time I work out the velocity/bearing I get a different answer than the one provided at the back of my textbook.

Would appreciate any help, thanks