This Practice Note explains what licensable marine activities are and outlines the procedure for obtaining a marine licence under the Marine and Coastal Access Act 2009 (MCAA 2009). Details on procedure include looking at pre-application steps, statutory consultees, fees and charges, impact assessments, validation, self service licensing, conditions, inquiries, the recovery power of the Secretary of State and regional licences for low impact maintenance activities at multiple sites. Marine licensable activities includes all vessels, aircraft or structures depositing, scuttling or incinerating any object or substance, or loading or beginning to tow, within the UK marine licensing area, as well as British vessels, aircraft or structures depositing, scuttling or incinerating any object or substance anywhere at sea.