What equipment is used to communicate with HARBOR COMM (Port Control)?

The correct option, which involves IVUT monitoring HARBOR COMMON, is appropriate because IVUT (Integrated Voice and Unified Technology) systems are specifically designed to facilitate communication within harbors and ports. These systems enable seamless communication with Port Control or Harbor Communications. They provide direct access to HARBOR COMMON frequencies, allowing vessel operators to receive crucial information regarding berthing instructions, navigational warnings, and other essential port operations directly.

Using IVUT for HARBOR COMM ensures that communications are efficient and tailored for the specific environment of a port, where real-time information exchange is vital for safety and operational efficiency. Familiarity with HARBOR COMMON frequencies ensures that watchstanders can effectively coordinate with port authorities.

While the other communication methods listed, such as satellite phones or radio communication via 2MC, can also be used in certain scenarios, they do not specifically cater to the demands and protocols of harbor communication, which focuses more on immediacy and specificity in maritime operations. Additionally, while visual signals can convey messages, they are not effective for the continuous and detailed communication required, particularly in busy harbor environments where multiple vessels may be transmitting and receiving critical information simultaneously.