Equal Time point with off route Alternates - How?
The basics I have:
Flying from point A to point B, where is the equal time point to return to A or continue to point B?
I can do that in still air and with wind using the formula:
Dist to ETP = (total Dist X GS Home) divided by (GS out + GS Home)
Where I am having problems and can’t find the information is
Flying from point A to point B, where is the equal time point to return to A or divert to the off route alternate at point C or what is the equal time point to 2 different off route alternates C & D when flying along route A to B. How do I do this and account for wind?
Is there a way of working this into the above formula or does it need to be done via plotting and if so how?
Any help would be greatly appreciated
Thanks
Greeny