I need help understanding how the following example has been worked out.
Example: an aircraft tracking at 330(deg) M has a suitable level of FL45
On the quadrantal rule for determining cruise levels has the following.
Magnetic track(deg)Cruising level
000-089 Odd thousands of feet
090-179 Odd thousands plus 500 feet
180-269 Even thousands of feet
270-359 Even thousands plus 500 feet
Are there other possible answers to this solution as it was not very clear and any help would be appreciated.