here's the official VNF planning tool -------- be warned ---------- it's rough - real rough - and, it takes a bit to get to use it ---------- you'll find out if you play with it
a beginners tip ------- only type the first 3 letters of the location you want to start of stop - let it have a little think - then, go on -- if you are too quick for it - it doesn't like that --------- it's sort of like French lunchtime - it doesn't like to be disturbed
http://www.vnf.fr/calculitinerairefluvial/app/Main.html
planning a route is a very very very complex matter in fact ------- and, unless you have learned by pain and mistake - expect your plans to lob on gods desk and god just laugh -----
I've mostly got it down pat now - but, it took some doing
