ALMR is a LMR system and by federal law can only be used on land. ALMR uses a different spectrum allocation than maritime radios. AMHS and the U.S. Coast Guard are required to conduct their communications in the maritime band. A gateway can be used to allow communications between land mobile radios and maritime radios when situations require. However, AMHS and the U.S. Coast Guard cannot use ALMR for their day to day maritime operations.