Robert, I've had lots of fun trying the routing out. I've tried with a fairly large London extracts and it is very good at making routes in most places when zoomed in, but I get a crash (program exits) when zooming out in mapsource. In general I can build up reasonably large routes, but sometimes I get a failure dialog when it fails to find a route. The failing to find a route seemed to happen more often when I was at the edge of the map, although that may be a coincidence. When it fails to find a route I can usually help it by picking an intermediate point first, and getting to the point I was aiming in a series of steps. Sometimes though it is just imposible to get past a particular point. I've noticed that on the edge of such an area, there are sometimes routes that go back and forward on the same road. I guess we need to know where the problem is and distinguish between the possibilities: 1. Problems with the tagging or topology of the OSM data itself. 2. Problems with extracting the routing network from the OSM data. 3. Problems with the incorrect .img format being generated. I plan to start with a small area, chose a single starting point and plot out all the places that can and can't be reached from there. Then look at the file in josm and see if there is anything funny about the data and if fixing it makes the problem change. ..Steve