For the purposes of ss. 30.61 and 30.62, motorboats are divided on the basis of their length into 4 classes as follows:
(1) Class A-those less than 16 feet.
(2) Class 1-those 16 feet or over but less than 26 feet.
(3) Class 2-those 26 feet or over but less than 40 feet.
(4) Class 3-those 40 feet or over.