Andrew noted in his twitter box at GrannyButtons that CanalPlanAC was down. It was for me too, so I checked with a site-Uptime service and it said the server was down (that is mihalis.net rather than the canalplanac domain). So a bit of digging and I found:

Nick Atty’s Canal Route planner (Canalplan AC) will be unavailable for a bit because I have to move the server.

Just completing final precautionary backups in case the current server never comes back to life (it has been mostly up and running for over five years and is just a homebuilt PC in my basement)

posted 1st June 2008

So lets hope you’re not just setting out on your boat and have forgotten to plan a journey and wanted to do it “last thing”.