🔍 Key Concepts

• Magenta symbols on NOAA charts and what they usually represent • Difference between areas to be avoided/used with caution vs. specific hazard types like cables or dumping • How line styles (solid, dashed, alternating) distinguish different area types on the chart legend

💭 Think About

• Look at a chart legend: which features are shown with long and short dashed magenta lines rather than solid or dotted boundaries? • Ask yourself: is this symbol marking a specific physical object on the bottom (like a cable or wreck), or an area where you should navigate with special care? • Consider which of the options is most likely to be highlighted in magenta as a routeing or cautionary measure rather than a fixed obstruction.

✅ Before You Answer

• Verify in a chart No. 1 or legend what magenta long-and-short dashed boundaries are used for. • Check whether cable areas and dumping grounds typically have different boundary symbols (e.g., notes, labels, or different line styles). • Confirm which of the listed options is treated as a special cautionary/navigation measure rather than a specific seabed feature.