Sailor's Balance( Stormwrack, p. 93)
You are experienced with the rolling decks of the ship and maintain strong footing, even in a terrible storm.
Profession (sailor) 4 ranks,
You gain a +5 competence bonus on Balance checks made while on the deck or in the rigging of a ship. You can move across a slippery deck (see page 20) at your normal speed.
Without this feat, each square of movement across a slippery deck costs 2 squares of movement.