NMFS proposes regulations that would revise Federal regulatory text regarding sport fishing guide services for Pacific halibut in International Pacific Halibut Commission Regulatory Areas 2C (Southeast Alaska) and 3A (Central Gulf of Alaska) to remove the requirement that a charter vessel guide be on board the same vessel as a charter vessel angler to provide sport fishing guide services. The proposed action would clarify that all sport fishing in which anglers receive assistance from a compensated guide will be managed under charter fishery regulations and all harvest will accrue toward charter allocations. This action would align Federal regulations with State of Alaska regulations. If approved, the definition of "sport fishing guide services" would be revised and a definition for "compensation" would be added to Federal regulations. Additional minor changes to the regulatory text pertaining to the charter halibut fishery would be required to maintain consistency in the regulations with these new definitions. This action is necessary to achieve the halibut fishery management goals of the North Pacific Fishery Management Council.