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

The U.S. Coast Guard communication station that provides High Frequency (HF) Maritime Safety Information (MSI) broadcast coverage for NAVAREA XII is indeed NMO, located in Honolulu. NAVAREA XII encompasses the area of the Pacific Ocean that includes the waters surrounding Hawaii and parts of the central Pacific.

NMO serves as the principal point for disseminating navigational warnings and crucial maritime safety information relevant to this region, demonstrating the importance of localized stations in providing timely and accurate updates for mariners.

While all the other stations listed provide various services and coverage in their respective areas, they do not specifically serve NAVAREA XII, highlighting the specialized role of NMO in ensuring the safety of navigation in Pacific waters around Hawaii. This understanding underpins the significance of proper geographical assignments for maritime communication stations, emphasizing the importance of mariners being aware of their local MSI sources.