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A line joining points of equal depth.
Also known as: Isobath chart symbol, Depth line chart, Fathom line
On a nautical chart a depth contour joins points of equal depth below chart datum, showing the shape of the seabed in the way a land contour shows the shape of a hill.
Joins points of equal depth below chart datum, describing the shape of the seabed.
Contexts: Navigation
Is drawn at selected depths rather than at even intervals, the chosen values reflecting the draughts of the vessels the chart serves.
Contexts: Navigation
A continuous line curving across the chart, labelled with the depth it represents.