Final answer:
An ECDIS must display chart updates according to the requirements set by the IMO and IHO. These updates ensure the navigational information is current and accurate for safe navigation. Option C is correct.
Step-by-step explanation:
The question asks about the requirements for the display of an Electronic Chart Display and Information System (ECDIS), as mandated by the International Maritime Organization (IMO) and the International Hydrographic Organization (IHO).
Out of the given options, the correct one is that an ECDIS must display chart updates. The primary reason for this requirement is to ensure that all the navigational information displayed is current and accurate for safe navigation. While the other options might also be features of an ECDIS, they are not mandated by the IMO/IHO.
The electronic chart of an ECDIS (Electronic Chart Display and Information System) must display chart updates and tidal predictions, as required by IMO/IHO.
Chart updates are important in ensuring that the displayed chart is accurate and up to date, as new information, such as changes in water depth, buoy positions, or navigational hazards, may become available.
Tidal predictions are also crucial for safe navigation, as they provide information about the water levels and currents at different times. This helps ships plan their routes and avoid areas with potential navigational challenges.