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yard
A 21 foot boat refers to the length of the boat. There is not comparison between length and width. It could be narrow as on narrow boats or wide as in sea faring boats,
A D/L ratio is calculated by dividing a boat's displacement in long tons (2,240 pounds) by one one-hundredth of the waterline length (in feet) cubed.
The length of the boat.
6.32766667 meters per second ==
A signal sound device
keep it aboard the boat when in operation.
Sound signaling device
yard
Orange smoke blowing from the boat.
harpooner
Stop getting in trouble with your parents aboard a small power boat.
Orange smoke blowing from the boat.
Stop getting in trouble with your parents aboard a small power boat.
Orange smoke blowing from the boat.
Friend
what indicates an emergency situation aboard