Does the duration of sound signals during fog maneuvers have a specific guideline?

The duration of sound signals during fog maneuvers does indeed have specific guidelines that apply broadly, rather than being categorized by vessel type or having no guidelines. These guidelines are established in the International Regulations for Preventing Collisions at Sea (COLREGs) and are intended to ensure safe navigation in restricted visibility.

In situations where visibility is impaired, vessels are required to make sound signals to indicate their presence and intentions. For example, under the COLREGs, a powered vessel must sound its horn at least once every two minutes, while a sailing vessel must also comply with specific sound signal protocols. The duration of these signals is intended to be clear and recognizable, allowing other vessels to determine their location and movements.

The choices pertaining to specific vessel types or denying the existence of guidelines do not accurately reflect the regulations in place, which apply to all vessels. Hence, stating that there are no specific guidelines is inaccurate, supporting the assertion that the correct answer reflects an understanding of the structured approach to sound signals in fog.