Which of the following is NOT part of the standard navigational information that may be passed to a disoriented mariner?

• A. Charted range bearings
• B. Charted depth of water
• C. Charted buoy positions
• D. Non-charted weather phenomena

Answer: (D)

When guiding a disoriented mariner, you rely on information that is fixed and depicted on navigational charts. Charted range bearings help you determine your position by comparing the line of sight to known landmarks. Charted depth of water shows where the water is shallow or deep and helps confirm your location and safe routes. Charted buoy positions indicate the location of aids to navigation, enabling you to identify channels, safe passages, and hazards. These items are standardized, verifiable, and directly used to reestablish your course and avoid danger.

Non-charted weather phenomena, on the other hand, are not part of the standard navigational information carried for re-fixing position. Weather can change quickly and is not guaranteed to align with charted data, so it’s treated as separate safety information rather than core navigational guidance. If weather data is needed, it should come from separate weather sources and warnings, not as chart-based navigation fixes.

So the item that does not fit as standard navigational information is the non-charted weather phenomena.