Hi all, I would like to ask for explanation of following colums I have in the record of Coastal Command flight:

1) time on course - time spend on operational patrol excluding the fperiod of flight from/to base? or something else?
2) there are two quite similar columns:
Air Range Covered
Track Range Covered
what is the difference? The first I suppose would be the total distance covered but what is the second one?

TIA

Pavel