On Fri, 2006-05-05 at 11:44 -0300, Miles Thompson wrote: > What an interesting problem. You might have better luck on a GIS or ocean > racing list. > Have you tried this: http://en.wikipedia.org/wiki/Rhumb_line I could do something like this using PostGIS and PHP, but a pure PHP solution is probably going to be a tad slow with real geometries. I would love to help out on this, can we collaborate on it (I will provide a CVS server etc if necessary)... --Paul -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php