You’re out on the water off Maui, the sun’s shining, the boat’s cruising, and someone lets out a cheerful whistle.

Then you hear it.

A deckhand laughs and says, “Eh—no whistling on the boat!”
A captain grins but still shakes their head like you just triggered a decades-old rule.

If you’ve ever wondered why whistling on a boat is considered bad luck, especially on fishing boats or ocean charters in Hawaiʻi, this No Whistling on a Boat guide breaks down where the belief comes from, why crews still honor it, and how it shows up on Maui snorkeling and fishing trips today.