Marine salvage encompasses services voluntarily rendered under a contract to save or assist a vessel or cargo in peril. Towage refers to the relationship between a vessel needing assistance and the vessel either pushing or towing said vessel. Pilotage refers to when a vessel under its own power but requiring the assistance of a tug boat is boarded by the tug captain to give proper orders.
All three of these concepts can be further understood by consulting the resource listed below or other resources detailed within this LibGuide.
Benedict on Admiralty (The Law of Salvage, Vol. 3A) by