Thanks for the replies and diagrams guys.It's sort of made things clearer,I did some practice questions and it seems that i was basically confusing myself with something reletively simple,the key words seem to be track or hdg in these questions.
These are two that i attempted,can you guys just confirm I'm right:
*An aircraft is flying from A to B, distance 212 nm. After flying 135 nm the aircraft is 9 nm Left of track. The alteration of heading to fly to B is
Answer: 11 degrees,the sum of the track error and second part of the equation as we want total heading alternation to reach B
* An aircraft is flying from C to D. track 270(T). distance 345 nm. After flying 135 nm the aircraft is 14 nm Left of track. The new track to D is
Answer: 274(T) ,this time we would only use the second part of the equation as we want the new track to D,so 270+ 4