Question 258 Deck Safety

The correct answer is C) lock & bridge communications. Channel 13 is primarily used for ship-to-ship communication, as stated in the question. In addition to this, Channel 13 is authorized for communications between vessels and locks or bridges. This allows for the coordination and exchange of information necessary for the safe passage of vessels through locks and bridges. The other answer choices are incorrect because they do not align with the authorized uses of Channel 13. Channel 13 is not used for aircraft-to-ship communications, either operational or navigational, nor is it used for coast-to-aircraft operational communications.