Or use the CSC DUATs automatic router.

Or to get a real visual hands on feel for it...

A globe and a string! g

Don't forget lubrication. Or use a virtual string on a net globe:
http://www.airspace-v.com/apt/kjfk glues one end to your departure.
And it also gives weather info!

virtuPIC

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Airspace v - international hangar flying
http://www.airspaec-v.com