What does the highlighted line labelled 10 join up?
A chart extract with land on the left. Three curving lines follow the coast, labelled 5, 10 and 20 working outwards from the shore, and the line labelled 10 is highlighted in gold. The depth figures printed between the lines get larger further from the shore.
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Places where the charted depth is 10 m. Depth contours join points of equal charted depth below chart datum, so they show the shape of the seabed at a glance. The actual depth along the line is 10 m plus the height of tide.
