In the illustration, on an ECDIS S-57...

Question 1 of 31048NqeOpjI3jVAbXaSZgGIW

In the illustration, on an ECDIS S-57 compliant ENC, which symbol represents a Zone of Confidence (ZOC) A2? Illustration D054NG

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Question 1 of 31048

In the illustration, on an ECDIS S-57 compliant ENC, which symbol represents a Zone of Confidence (ZOC) A2? Illustration D054NG

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🔍 Key Concepts

• Zone of Confidence (ZOC) categories on S-57 ENCs (A1, A2, B, C, D, U) and what they tell you about survey quality and position accuracy • How CATZOC symbols are drawn on ECDIS (number of stars, pattern, and outline shape) • Difference between higher-quality surveys (A1/A2) and lower-quality (B/C/D) in terms of position error and depth reliability

💭 Think About

• On an ENC, how does the symbol change as survey quality improves from C/D to A1/A2? Think about the number of stars and how they are arranged. • Between A1 and A2, which one is slightly less accurate, and how is that reflected visually in the symbol compared with the very best category? • Look at each of the four symbols (A–D): which one suggests a good but not the very best survey quality—better than B/C/D but not quite A1?

✅ Before You Answer

• Confirm how many stars are used for each CATZOC category and what pattern is used for A2 in particular. • Check whether the ZOC A2 symbol has a dashed or solid outline and whether that matches what you see for any option. • Verify which option’s symbol corresponds to a high-quality survey with slightly lower position accuracy than A1, not the poorest or the very best.