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From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Helmsman's Recourse (Greater)

ITEM 7
Price 625 gp
Bulk 1
AC Bonus +2
Hardness 8
HP 60
BT 30

Shield throw 30 ft.

This standard-grade duskwood meteor shield (Hardness 8, HP 60, BT 30) is a wheel from a ship. While wielding the shield, you gain a +1 item bonus to Sailing Lore and to Athletics checks to Swim.

Activate (concentrate)
Frequency once per day
Requirements You're in a body of water

Effect For 10 minutes, you don't sink if you haven't succeeded at a Swim action on a turn, and if you're submerged, you automatically ascend 10 feet at the end of your turn. When you Activate the shield, it casts Water Walk on you.
Pathfinder Treasure Vault (Remastered)ORC