INT 1 · I 21
Dredged channel or area
Depths & contoursCore
A bounded channel or basin carries a maintained-depth or dredging legend.
What it means
Dashed limits enclose a dredged channel or basin. A legend may state the dredged or maintained depth and the responsible authority.
Why it matters
Silting can reduce the available depth between surveys. Check current harbour information and Notices to Mariners before relying on the maintained figure.