Turn the boat sideways to the waves, accompanied by harsh, aggressive use of the whistle....

Pi Patel: For castaways who must share their lifeboats with large, dangerous carnivores, it is advisable to establish a territory as your own. The following course of action is recommended. Step one: Choose a day when waves are moderate, but regular. Step two: with the lifeboat facing into the waves, making the ride as comfortable as possible, blow your whistle soothingly. Step three: turn the boat sideways to the waves, accompanied by harsh, aggressive use of the whistle. With sufficient repetition, the animal will associate the sound of the whistle with the discomfort of seasickness. Similar methods have long been used by circus trainers, though they generally lack access to rough seas. [Pi climbs onto the boat and urinates at the end of the tarp] Pi Patel: MINE! You understand? Yours, mine! You understand? [Richard Parker sniffs, then turns and urinates in Pi's face] Pi Patel: [v.o] Step four: disregard steps one through three.