But this is a four letter one - Coastal Navigation and Tidal Planning. This is a pre-requisite of four star sea, so I took over Jen's Aqua Adventures shop in San Diego over a couple of evenings to deliver this course to local paddlers.
I did have to get my head around the US differences in navigation, their bouyage is backwards and they have negative tides and no cardinal marks, phew! Luckily Ginni was around to help out when it all got a little to complicated for the simple English boy!
Students seemed to enjoy it though, look how studious they are!