Coast Guard Authorization Act of 2003

Coast Guard Authorization Act of 2003 - Authorizes appropriations for the Coast Guard for FY 2004.Amends Federal law to permit the Secretary of the department in which the Coast Guard is operating (Secretary) to provide bonuses to enlisted members who complete training in a critical skill.Increases the limits to the number of active duty commissioned officers (except commissioned warrant officers) and the percentages of commanders and lieutenant commanders on the active duty promotion list. States that in time of war or national emergency the Secretary shall establish the total number of active duty commissioned officers (excluding commissioned warrant officers).Authorizes the Secretary to make direct loans to eligible entities for the acquisition or construction of military housing units.Authorizes the Coast Guard Auxiliary to exercise dominion over personal property, subject to the Commandant's approval.Amends the Ports and Waterways Safety Act to permit the Secretary to cooperate with a public or private entity for Marine vessel traffic services.Amends Federal law to revise suspension criteria, and the bases for suspension and revocation of a license, certificate of registry, or merchant mariner's document.Increases civil penalties for violations of bridge statutes and failure to comply with established safety standards.Amends the Oil Pollution Act of 1990 to increase the amount of funds available to the President for the removal of a discharge of oil or a hazardous substance.Amends Federal law to authorize members of the Coast Guard, subject to guidelines approved by the Secretary and the Attorney General, to carry firearms, make arrests, and seize property.Amends the National Historic Lighthouse Preservation Act of 2000 to require the Secretary oversee the conveyances of lighthouses.Authorizes appropriations for capital expenses related to Loran-C navigation infrastructure.