I’m not sure where this originated, but this is a helpful reference for handling diversions. When it becomes obvious that you are going to have to divert, remember your alphabet, particularly A thru G:
A – Airport— Where do we need to go?
B – Best guess on your heading (refine it in a minute)
C – Clock –Start your time
D – Distance –How far is it?
E – ETA and groundspeed –When will I arrive, what is my groundspeed?
F – Fuel –Do I have enough to make it?
G – Ground –Call someone on the ground to make change in plan (ATC, FSS etc)
This little checklist can be a great help when you’re in a pinch and need to make a change of plans!