Which system is used for transmitting Maritime Safety Information via satellite?

SafetyNET is the correct answer because it specifically refers to a system designed for the transmission of Maritime Safety Information (MSI) through satellite networks. It operates within the framework of the Global Maritime Distress and Safety System (GMDSS) and utilizes Inmarsat satellites to deliver crucial information including navigational warnings, meteorological forecasts, and other urgent maritime safety messages directly to ships.

This system is essential as it enhances safety at sea by ensuring that vessels receive important updates and alerts regardless of their location, thereby increasing situational awareness among mariners.

Other systems mentioned like NAVTEX are also used for disseminating Maritime Safety Information, but they operate through radio waves rather than satellite communications. While GMDSS encompasses various systems and protocols for maritime communication and safety, it is not a transmission system itself but rather a holistic framework that includes SafetyNET among other components. Inmarsat B is a satellite communication service that can be part of GMDSS but does not specifically focus on transmitting MSI as SafetyNET does.