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 traffic separation scheme bearings
• C. Charted buoy positions
• D. GPS time signals

Answer: (D)

In guiding a disoriented mariner, you provide cues that help them fix their position on the chart. Charted range bearings give a distance-based line to a known object, charted traffic separation scheme bearings offer bearings relative to the lane boundaries to help re-enter safe traffic flow, and charted buoy positions serve as fixed reference points on the chart. GPS time signals, however, are timing references used by the GPS system to calculate position rather than navigational cues you would pass to reorient someone. They don’t provide a usable bearing or landmark for fixing location, so they are not part of the standard navigational information handed to a disoriented mariner.