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

Question 1 of 310489pRFzyXvgRGiSezL1FX6

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

Back

Question 1 of 31048

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

No Illustration

This question does not have an illustration

🔍 Key Concepts

• Zone of Confidence (ZOC) categories on ENCs (A1, A2, B, C, D, U) and what “U” (Unassessed) means • How S‑57 ENC symbols show ZOC quality—usually a combination of stars and letters inside a small magenta or black box • Difference in appearance between higher-quality ZOC areas and unassessed / unknown quality areas

💭 Think About

• Look at how many stars or letters appear in each figure: which one looks like it indicates no quality assessment rather than a graded level of confidence? • Which figure’s symbol looks the least detailed or shows that survey quality is not evaluated, instead of giving a specific accuracy? • Compare which figures clearly show graded ZOC categories (like A1, A2, B, C, D) and eliminate those, then see which remaining figure best matches an unassessed area.

✅ Before You Answer

• Verify which ZOC category letter “U” stands for in official ENC documentation (e.g., Unassessed / Unassessed quality). • Check the legend or key for S‑57 ZOC symbols to see how an unassessed area is depicted differently from A–D categories. • Confirm that the chosen figure’s symbol does not show a definite accuracy grade (like specific stars or category letters), but instead represents unknown / unassessed survey quality.