Quick Summary of Steps for determining longitude from LAN (Local Apparent Noon) and GAT (Greenwich Actual Time).
Step1 - Determine the following:

Time
LAN:
GAT:

Step 2 - Figure out the difference

Difference(LAN – GAT) = ‘Hours’:’Minutes’

Step3 - Convert your difference from Step 2 into Degrees

Take your ‘Hours’ and multiply by 15^o/hr. = ‘Degree 1’
Take your ‘Minutes’ and multiply by 1^o/4 min. = ‘Degree 2’

Step 4 - Add your 2 'Degree' numbers to arrive at your longitude

(‘Degree1’) + (‘Degree2’) = ‘Longitude’

Step 5 - Determine if Your Longitude is East or West of Greenwich

If LAN earlier than GAT = West
If LAN later than GAT = East

Step 6 - Enter Information to Land Helicopter

Enter ‘Longitude’ / E or W
And Press the ATTEMPT LANDING button

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