The Captain School Key West License Endorsement classes are USCG Approved. WE GIVE THE TEST. This is a four hour USCG Approved classroom based course that will cover the written examination requirement for a candidate holding a USCG Master license to obtain a Sailing or Auxiliary Sailing Endorsement. The USCG requires that a Master inland must have at least 180 days of sailing experience in their life for a sailing endorsement and a Master near coastal needs at least 360 days of sailing experience to qualify for this endorsement.