🔍 Key Concepts

• International Code of Signals (ICS) flags and their meanings • Difference between flags indicating person overboard, quarantine, or crew recall • Customary port practice when a ship is preparing to sail imminently

💭 Think About

• Think about which single-letter flag is traditionally used as a recall signal for crew to return to the ship when departure is near. • Eliminate flags you know are used for diver down, pilot on board, or vessel at anchor or other specific conditions not related to getting underway. • Consider which signal would logically be hoisted before departure to ensure all hands are back on board and accounted for.

✅ Before You Answer

• Verify in an International Code of Signals table what each of the listed letters (A, H, U, P) means. • Confirm which flag has a meaning related to "about to sail" or "return to ship" rather than safety or navigational warnings. • Be sure you are not confusing this with flags that mean "I require a pilot", "I have a pilot on board", or "duty watch".