What signal is NOT considered a part of the distress signal regulations?

The searchlight is not recognized as an official distress signal according to maritime regulations. Distress signals are specifically defined and recognized methods used to communicate that a vessel or individual is in danger and requires assistance.

Common distress signals include the strobe light, which emits bright flashes in a rhythmic pattern to capture attention, sound signals like prolonged blasts of a whistle or horn, and smoke signals that produce visible smoke to signal distress. These methods are standardized and universally recognized by mariners.

In contrast, the searchlight, while useful for visibility and signaling to nearby vessels, does not inherently communicate distress in a universally recognized manner. It may be employed for signaling purposes but does not meet the specific criteria set forth in the regulations for distress communication. Thus, it stands apart from the recognized distress signals.