You’re totally right, this simple important information, though easy to gather, is desperately missing. We can find some lists here and there, but they’re all quite short.

Here’s one : http://www.renneslechateau.com/anglais/gps.htm

Some coordinates can be found on wikipedia as well, for example http://fr.wikipedia.org/wiki/Saint-Just-et-le-B%C3%A9zu

But we need the coordinates of churches, not those of the middle of the village.

Actually, a map of the area (IGN 2347 OT : Quillan Allet-les-Bains) gives this information. It has several grids (kilometric and Lat-Lon), and you don’t even need those grids since you can measure the points’ positions in millimeters and keep working in millimeters. Putman and Wood did it (published in their book “The Treasure Of Rennes-le-Château - A Mystery Solved”), I did it too (and sometimes disagree with their measurement but not much), and I suppose many people did it.

What if the map is wrong? So far, it has never been wrong enough for me to notice anything (well, yes: once, but it was just a path on the way up to Cardou, not a building). Then again, I don’t have a GPS myself :(.

Henry Lincoln should open a website soon, maybe he plans to publish the coordinates there. If not, that’s a suggestion we could make.