By my reckoning we drifted 120 miles off course 4 minutes ago, so using the 1 in 60 rule we should turn left 15 degrees for 18 minutes then turn...errm...allowing for the earth's rotational speed and shift in the magnetic North pole, possibly another two degrees, ahh but that was 90 seconds ago, so errrm...
Shut the f@#k up Goose!