Final answer:
The data layer categories to be displayed on ECDIS include ECDIS warnings and messages, Notice to Mariners, and Hydrographic Office data. The correct answer is 'All of the above'.
Step-by-step explanation:
You asked which of the following are data layer categories to be displayed on ECDIS (Electronic Chart Display and Information System). The categories include:
- ECDIS warnings and messages
- Notice to Mariners
- Hydrographic Office data
Hence, ECDIS can display various types of navigational data, including warnings and messages specific to the system's functionality, updates provided through Notice to Mariners, and data produced by Hydrographic Offices for maritime navigation.
Hence, option D is correct.