Triforce Chart 1 is found on the B-5: Islet of Steel. Sail to the small iron fortress and blow up the ship guarding its entrance. Sail inside (push forward on the analog stick to move while there's no wind) and climb up the stairway.

Stand on the wind symbol and play the Wind's Requiem to make a treasure chest appear. Inside, you will find?Triforce Chart 1. Refer to the?Triforce Quest?section on how to translate and find the shard marked on the map.

It leads to Triforce Shard 1 near B-4: Greatfish Isle.