Possible Clues:

• With these, one can surely walk on water
• Close up examples of adapted balance
• Balance for one second on large animal
• Ability to keep one's balance on a ship
• Ability to balance on board
• Marine mammals circling for example -- sailors want them
• Marine mammals, perhaps captured -- one hopefully has them on board
• Steadiness on a boat
• Steadiness on a ship
• Good standing in the Navy?