When rendering honors, how many whistle blasts are used to call attention to port?

When rendering honors, two whistle blasts are used to call attention to port. This specific signaling convention is established by naval protocol to indicate that a salute is being rendered to the side of the ship where personnel or an event of importance may be taking place. Utilizing two blasts serves to clearly distinguish the action from other signals, ensuring that all members aboard are aware of the command to focus their attention on the port side.

Employing a standardized number of blasts for calling attention helps to maintain uniformity in communication across the fleet and makes it easier for crew members to recognize the intent behind the signal. This clarity is essential for ensuring proper decorum during ceremonial practices and while acknowledging other vessels or dignitaries.

Understandably, using a single blast would not provide the necessary emphasis for a call to attention, and more than two blasts could lead to confusion regarding the action being signaled. Thus, two blasts effectively communicate the command without ambiguity.