Well, thanks for the help guys... not.
Anyways, I used an article a local instructor wrote about how to xcountry plan for gliding.
In summary, here's the info ...
1. Decide your start and destination.
2. Plan the route, using intermediate airports as landing sites, for if you have to land out.
3. Use 0.5 of published best l/d ratio to calculate go-ahead points between waypoints. e.g. you might have a go-ahead at 6 nm (1/2 way between two waypoints 12nm apart) with a go-ahead altitude of say 4000 feet. These give you some assurance that you can make it to the next waypoint. Allow 1000 + FE so that you have height to make a normal pattern at the waypoint if necessary.
4. Plot your course and mark the go-ahead points.
5. Use 3/4 of best l/d to calculate final glide circles back from your destination, so that you know what height is 'safe' to just glide in from.
Hope this helps someone.