When an aircraft is facing North and wants to turn onto a West heading using a compass, what heading should it roll out on?

When an aircraft is initially facing North, its heading is 0 degrees. To turn onto a West heading, the aircraft needs to align itself with a heading that corresponds to West. In terms of degrees, a direct West heading is defined as 270 degrees on a compass.

To understand this better, when considering the compass, North is at 0 degrees, East at 90 degrees, South at 180 degrees, and West at 270 degrees. Therefore, after performing a turn from North to West, the aircraft should roll out at 270 degrees.

The other options represent incorrect headings in this context: 90 degrees points East, 180 degrees points South, and 360 degrees effectively points back to North. The correct choice, 270 degrees, accurately reflects the necessary adjustment for the aircraft to achieve a West heading.