What is the flag signal for boat recall?

The flag signal for boat recall is represented by the Quebec flag, which is a solid yellow flag. This signal is universally recognized and indicates that boats should return to their station, or that vessels in the water must head back. It is an essential signal for ensuring the safety and coordination of maritime operations, particularly when it is necessary to gather personnel or vessels quickly.

The other flags mentioned represent different messages and are not used for the call for boats to return. For example, the Foxtrot flag signals that a ship is maneuvering to avoid a collision; the Tango flag is used to indicate that a vessel is engaged in underwater operations; and the November flag is typically used in a variety of communication contexts, such as indicating "no" or "negative." Thus, Quebec is the appropriate choice for the recall signal as it specifically pertains to calling boats back.