Navy Jack

Mounts with canvas header and brass grommets

The jack of the United States is a maritime flag representing United States nationality flown on the jackstaff in the bow of its vessels. The U.S. Navy is a prime user of jacks, but they are also used by ships of the Coast Guard, Military Sealift Command, National Oceanic and Atmospheric Administration, and other governmental entities. "The jack is flown on the bow (front) of a ship and the ensign is flown on the stern (rear) of a ship when anchored or moored. Once underway, the ensign is flown from the main mast."

Quarantine Flag

A plain yellow flag (‘Q’ Quebec in the International Code of Signal Flags) that is flown by a vessel arriving in port stating that it is healthy and requires medical clearance or free pratique

Absent Flag

In US usage the practice, almost certainly obsolete, of flying a plain blue flag from the starboard yardarm (or spreader) of a pleasure vessel when the owner is absent

Dinner Flags

In US usage the practice, almost certainly obsolete, of flying a white flag from the starboard yardarm (or spreader) of a pleasure vessel when the owner is dining, and from the port yardarm when the crew are at meals

Protest Flags

Storm warning flag sets

Gale

Hurricane