For CYOA I just keep a little record going in my iPhone during the charter, and at the end of the charter I copy/paste it into an email and send it to them. That way they can print it out for the dock-staff. It also helps me keep track, because little things are easy to forget.

A form would be nice, but probably more important is simply taking the time to get the Charter company the info they need in any kind of printable form.