Wiktionary
seakeeping
n. Effective operation of a ship at sea; remaining seaworthy.
Wikipedia
Seakeeping
Seakeeping ability is a measure of how well-suited a watercraft is to conditions when underway. A ship or boat which has good seakeeping ability is said to be very seaworthy and is able to operate effectively even in high sea states.
Usage examples of "seakeeping".
To a casual observer, it might even seem there was little damage to the ship, but the torpedo had impaired her seakeeping ability for the time being.