Originally Posted by Brian
Louise will swiftly correct me if I am wrong
Not tonight though, as she's on a secret mission, which VIPs like you, Brian, and Roy, will learn about very soon
You are of course correct!
I'm vagugely familiar with the Arcachon Basin and I don't think you will need CEVNI to enter.
Basic pilotage information is available in Reeds Nautical Almanac and I would strongly recommend that you have a copy of Reeds to hand before visiting (you already have a copy, yes?) The Arcachon section particularly warns of the dangers of attempting to enter the basin at night or SW-N winds (ie anything blowing on-shore!) The chartlet in Reeds also shows fairly complex sandbanks and shallow water at the entrance.