Convergency question
Has anyone got any rules of thumb or methods which help working out if the angle is plus or minus when you come to apply it at the other end of a great circle depending on the hemisphere etc.
Some how this afternoon i have managed to beat proberbility and get it wrong at least 75% of the time. Right numbers but applied in the wrong direction.
Anyway back to Airlaw to see if i can beat my previous record of 45mins study without losing the will to live and falling asleep.
MJ