Originally Posted by downeast450
Let us not forget, navigation by contrail!
In general it doesnt work if you are crossing oceans.
When i came accross the Atkantic last time I didnt see a contrail for three weeks.
I got to thinking about it and worked out the first contrail would be London to Barbados. I dropped a waypoint on my course and amazingly a week later i looked up and saw a contrail! I rushed down and it was EXACTLY on the Waypoint!!!
(Ok, it wasnt ON the waypoint, but it was crazy close