MSI can be obtained by one (or more) of the following:

The correct answer indicates that MSI, or Maritime Safety Information, can indeed be obtained through multiple channels, including NAVTEX, SafetyNET, and HF NBDP.

NAVTEX is a system designed for the automated transmission of maritime safety information to ships. It operates on designated frequencies and broadcasts updates regarding navigational warnings, meteorological information, and other urgent safety messages, making it a vital tool for mariners.

SafetyNET, which utilizes satellite communications, provides a similar service but is typically used for vessels operating in areas outside of traditional communication ranges. SafetyNET can deliver MSI much more broadly and can include more extensive information catering to ships at sea.

HF NBDP, or High Frequency Narrow Band Direct Printing, is another method for receiving MSI, typically used for ship-to-shore communications. It allows for the transmission of safety information over great distances and is especially helpful when traditional VHF communications are not available.

Understanding that all three methods can deliver maritime safety information gives a comprehensive view of how mariners stay informed about potential hazards at sea. Each system has its own unique advantages and operational contexts, ensuring that vessels can access critical safety updates wherever they are.