Whirlybird is right IMO: flying is an environment in which you ought to expect the unexpected, under pain of... severe pain if it all goes mammaries up.
e.g. divert NOW, NOW, NOW. Damn, pencil's bust, can't find this, that and t'other. Where's me whizzy thingy - can't reach my flight bag on the back seat. ATC 'Orbit, there's a ... in your 12 o'clock same alt...'
'Don't panic, Mr Mainwaring, don't panic...!'
I'm currently working on 'immediate' diversions, estimating track and distance, or mentally calculating distance off track of alternate/distance to alternate x 6 (to give angle from current track [forget decimals]).
Although I've several marked pencils, and a thumb of 10nm, and a whizzy-git, and charts, the challenge is doing it down to absolute basics when put 'on the spot'.
I'd also like to think I've got a life!
