This small, circular islet is made up of large segments of steel and features a grassy upper area that you cannot reach. A wide opening leads inside the Islet of Steel, but two wall-mounted cannons and several Warships guard it.
Triforce Chart #1
Bomb the two wall-mounted cannons and the Warships guarding the entrance to the Islet of Steel. Use the Grappling Hook to pull chests of Rupees from the destroyed Warships, then sail into the Islet of Steel’s large entrance.
Hop out of your boat and swim to the steps in the islet’s interior. Play the “Wind’s Requiem” at the Wind Crest to reveal a chest containing Triforce Chart #1.
Sea Platform
Sail to the Sea Platform in this sector, and climb its ladder. Defeat the enemies on top of the platform (which include two Wizzrobes) to reveal a chest, which contains a minor reward.
Silver Rupee (via Treasure Chart #35)
Find and open Treasure Chart #35 (inside the Wind Temple [D1] dungeon) to pull a chest from the Great Sea near the Islet of Steel. The chest contains a Silver Rupee.