For doing eskimo rolls in a kayak, it would be very helpfull, because it would make you one with the kayak. It would improve the paddle-ability too. And a seatbelt can be unlocked in a snap.
For just walking down the sidewalk, someone should invent a personal seatbelt with a self-contained airbag!
No....seatbelts could be helpfull in a boat...but should be optional...."it's you life & your choice."
So, does Wal-Mart sell a seatbelt kit? Seatbelts would have been helpfull on that expensive 37' Formula boat that drove straight into a large outcropping of granite bedrock..........ouch.
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Seen all the reader comments in today's Union Leader?