What does a vessel's position rely on in E-NAV?

A vessel's position in Electronic Navigation (E-NAV) primarily relies on information from satellites and positioning systems. This technology uses Global Navigation Satellite Systems (GNSS), which include systems like GPS (Global Positioning System), to provide accurate and real-time positioning data. These satellite systems enable vessels to determine their precise position over the Earth's surface, which is critical for navigation, safety, and voyage planning.

The reliance on satellite systems ensures that positions are obtained with high levels of accuracy and reliability, which is essential in modern navigation as it allows for the integration of other navigational aids and information, helping to enhance situational awareness and operational efficiency on board.

In contrast, other methods mentioned, such as manual logs of previous routes and visual sightings of landmarks, can provide some context or supplementary data for navigation but do not offer the accuracy, consistency, or real-time updates that satellite and positioning systems provide. Weather patterns, while important for navigation decisions, do not directly determine a vessel's geographic position.