Hovercraft

[Lead Balloon]

From the Marine Safety (Domestic Commercial Vessel) National Law Act 2012:

8 Definition of vessel

(1) In this Law:

vessel means a craft for use, or that is capable of being used, in navigation by water, however propelled or moved, and includes an air‑cushion vehicle, a barge, a lighter, a submersible, a ferry in chains and a wing‑in‑ground effect craft.

And if it’s a recreational vessel...

Here’s what the NT Marine Act 1981 defines “vessel” to mean:

"vessel", see section 8 of the Marine Safety National Law.

That’s the definition quoted above.

Bottom line: Although it’s part fish and part fowl, it’s treated as a fish for regulatory purposes.