Mary-

It has some quick release straps that can be undone and clipped forward to the hiking straps when not in use. Otherwise it has loops on the front edges of the seat bottom and top which could be used to fasten to the hiking straps when you are underway.

I only fasten mine to the boat when I'm sailing. When I'm cruising easy I'm sitting on it and have it underneath me. I haven't lost it unexpectedly yet, but if I do I guess it will be time to practice the man overboard drill. Maybe I should come up with a bungie/quick release buckle set up to avoid this scenario.