š Key Concepts
ā¢ Dead Reckoning (DR) position vs. time ā how to plot and read where you are at a specific time on the track line
ā¢ Charted areas and symbols ā differences between restricted areas, regulated areas, traffic separation schemes, and pipelines
ā¢ Boundaries and labels on the chart ā look at when your DR track crosses a clearly marked line or symbol
š Think About
ā¢ On your DR track, where is your vessel located at about 1817, and what specific line, symbol, or boundary does it coincide with at that moment?
ā¢ How are restricted areas, regulated areas, traffic separation schemes, and pipelines each shown on the chart, and which of those styles of markings lies directly under your DR at 1817?
ā¢ Does your DR show you entering, crossing, or leaving a marked area or feature at that time, and how does that relate to the wording of each option (enter, depart, cross)?
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Before You Answer
ā¢ Confirm the exact DR time marks on your track (e.g., 1810, 1815, 1820) and interpolate where 1817 falls between them.
ā¢ Verify the chart symbol and label at the point where your DR is at 1817 (e.g., āRestricted Areaā, āRegulated Areaā, TSS lane/zone, pipeline).
ā¢ Check whether the DR at 1817 is just inside, outside, or directly on the boundary of that feature to decide if you are entering, departing, or crossing it.