Re: How to secure a baby
Thanks everyone for their suggestions. We have since decided to go with a chair we got that has a nice wide base with rubber non-slip feet. It will be more comfortable then his car seat, he can still be strapped in and should stay put even when heeling. We also have a pack and play that should fit down in the cabin where we can wedge it in place with some cushion for his naps. We don't want to install any hooks or the like as this phase won't last long.
As for the baby carrier/bjorn idea we're always concerned about accidentally slipping and I don't think we could wear one when we have our PFD on (not that we are likely to fall over board but you never know)