The U.S. Coast Guard communications station providing HF MSI broadcast coverage for NAVAREA IV is:

The U.S. Coast Guard communications station that provides HF MSI (Maritime Safety Information) broadcast coverage for NAVAREA IV is NMF, located in Boston. This station is responsible for disseminating important maritime safety messages, including navigational warnings and other critical information necessary for the safety of vessels operating in that region.

Each Coast Guard station has specific geographic responsibilities, and NMF specifically covers the areas included in NAVAREA IV, which comprises parts of the eastern Caribbean Sea and the Gulf of Mexico. This makes NMF vital for maritime operations, ensuring that vessels receive timely information to navigate safely.

Other stations, while they have their own coverage areas and responsibilities, do not specifically handle the broadcasts for NAVAREA IV. This differentiation is essential for understanding the roles of various communication stations in the GMDSS network and their specific responsibilities in promoting maritime safety.