Rough seas on Sunday resulted in "minor damage" to 13 vehicles aboard Hawaii Superferry during its voyage from O'ahu to Maui.

The company said the conditions caused some parked vehicles to shift during transit. "There was no substantive damage to the ship," said a company statement.

"Affected passengers have been contacted and we are facilitating their claims. This is the first incident in which significant vehicle shifting has occurred," the statement said.

"Vehicles are now being tied-down in affected areas on days when conditions are unusually rough to mitigate any damage."