Which channel is utilized for the required bridge-to-bridge watch?

The channel used for the required bridge-to-bridge watch is VHF-FM on Channel 13 in most areas of the continental United States. This specific channel is allocated for the purpose of facilitating communication between vessels, particularly for navigational safety and coordination in marine traffic. It aids in the exchange of important information, such as the location and intentions of vessels, which is crucial for preventing collisions and ensuring safe navigation in busy waterways.

This channel is intended to be monitored by vessels engaged in commercial operations and those navigating in close proximity to each other, making it an essential means of communication in congested areas. It is also recognized and adopted in various maritime regulations, emphasizing its importance in the maritime communication setup.

While other channels mentioned in the options serve specific communication purposes (like DSC on Channel 70 or VHF-FM on Channel 16), they do not fulfill the specific requirement for bridge-to-bridge communications as effectively as Channel 13 does, given its focus on direct vessel-to-vessel interaction on the water.