In theory, admiralty law only applies to things “nautical” . . . at sea or in large bodies of water.
However, there’s a “wing” in the legal reform/patriot/sovereignty movement that contends that our government has brought admiralty law onto the land. Under this contention, automobiles are deemed “vessels“; police cars are deemed “cruisers”; the streets are deemed to be “rivers of asphalt”; and court rooms are structured in such a way that if you pass through the gate at the “bar” and enter into the court “arena”, you’re deemed to have voluntarily entered into admiralty jurisdiction and exposed yourself to a law form that is harsh and, for most people, nearly incomprehensible.