What does the ringed figure, with a line under it, tell you?

That spot dries: it is 1.4 m above chart datum

The water there is 1.4 m deep at chart datum

A rock there stands 1.4 m above high water

What does this chart symbol show?

A wreck considered dangerous to surface vessels

A wreck not considered dangerous to surface vessels

A rock awash at the level of chart datum

A wreck showing above the water

Good holding ground for anchoring

Places where the charted depth is 10 m

Places where the tide rises 10 m

Places where the stream runs at 10 knots

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Day Skipper Quiz

6 picture questions, each answer explained.