For a vessel being towed, how often is the fog signal emitted?

For a vessel being towed, it is required to emit a fog signal every two minutes. This regulation is in place to ensure the safety of the vessel being towed as well as other maritime traffic. The frequent emission of the fog signal helps to alert nearby vessels to the presence of the towed unit in low visibility conditions, such as fog. It enhances the predictability of the vessel's location and movements, which is crucial for navigation safety.

The two-minute interval is specifically stipulated in regulations governing sound signals in restricted visibility, enabling nearby vessels to maintain awareness and avoid potential collisions. This timely signaling increases the chances of other boats taking appropriate caution in the vicinity.

Vessels other than towed vessels have different requirements for fog signals, which is why options reflecting intervals of one minute, five minutes, and ten minutes do not apply to this specific situation. Each interval would not provide sufficient alertness to effectively navigate in foggy conditions.