🔍 Key Concepts
• NAVTEX message categories and which ones are considered safety-related or mandatory (e.g., A, B, D, L)
• How Maritime Safety Information (MSI) can be received by multiple systems (NAVTEX, SafetyNET, etc.) under GMDSS
• What the GMDSS Radio Operator is actually allowed to filter or program on a NAVTEX receiver (stations vs. categories)
💭 Think About
• Look at each option and ask: does this reflect what the operator is REALLY permitted to program on the NAVTEX (stations, categories, or both)?
• Consider whether mandatory categories can ever be deselected and, if so, under what specific condition related to other MSI systems.
• Think about how you actually enable reception from a new NAVTEX station: do you enter a SELCAL number, or do you select something else?
✅ Before You Answer
• Verify which NAVTEX categories (A, B, D, L) are treated as mandatory safety information under GMDSS guidance.
• Confirm whether the rules allow suppressing reception of mandatory categories if the same information is being received via another MSI system.
• Check how a NAVTEX receiver is normally configured for a new station: do you select a station ID from a list, or manually input a SELCAL number?