Yes, you can take a course online to help satisfy the exam requirements for obtaining your captain’s license, provided the course is approved by the U.S. Coast Guard’s National Maritime Center (NMC).Captain's Licensing EndorsementsThe NMC is the agency that sets requirements for, oversees and issues mariner credentials, including endorsements such as captains’ or masters' licenses. The requirements for obtaining your license depend upon the exact type of endorsement you seek. See the NMC’s site...