When approaching a bend in the channel with limited visibility, you should sound __________.

When navigating a bend in the channel where visibility is restricted, it is important to use sound signals to communicate your presence to other vessels. The correct response is to sound one prolonged blast for a duration of 4 to 6 seconds. This signal indicates your intention to communicate your position and awareness of the limited visibility, allowing other vessels in the vicinity to respond appropriately.

The use of a prolonged blast is recognized in the international rules for preventing collisions at sea and is specifically designated for situations where a vessel is restricted in its ability to maneuver, such as when approaching a bend or navigating in foggy conditions. This helps in alerting other operators that you are approaching, which is crucial for maintaining safety on the water.

In contrast, other signaling options, such as one short blast or two short blasts, convey different intentions and are not suitable for indicating a presence in reduced visibility. For instance, a single short blast typically indicates intent to pass another vessel on the starboard side, while two short blasts suggest the intention to pass on the port side. Neither of these would effectively communicate the situation encountered when approaching a bend with limited visibility. Selecting a sound signal that accurately reflects the context of navigation ensures better communication among mariners and enhances safety.