Make sure you hang a large diameter line (old and frayed is better) off the stern or side of the boat when at anchor. Teach your cat that they can climb up it if they fall overboard. To train the cat, put the cat in the water next to the line. It will figure out how to climb it. Then put the cat into the water away from the line and coax you cat toward the line.
"When in command, command." -- Admiral Nimitz
Difference between a power boater and a sailor out on the water: A power boater is going some place special, a sailor is already there.
s/v Zotz 1981 Pearson 365 Ketch Hull #375