🔍 Key Concepts

• Dead Reckoning (DR) position vs. time – how to plot and read where you are at a specific time on the track line • Charted areas and symbols – differences between restricted areas, regulated areas, traffic separation schemes, and pipelines • Boundaries and labels on the chart – look at when your DR track crosses a clearly marked line or symbol

💭 Think About

• 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? • 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? • 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)?

✅ Before You Answer

• Confirm the exact DR time marks on your track (e.g., 1810, 1815, 1820) and interpolate where 1817 falls between them. • Verify the chart symbol and label at the point where your DR is at 1817 (e.g., ‘Restricted Area’, ‘Regulated Area’, TSS lane/zone, pipeline). • 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.