Your yacht draws 1.8 m. With these figures, how much water is there between the keel and the bar?
A cross-section: a yacht afloat over a raised bar on the seabed. Labels: height of tide 2.5 m, from the chart datum line up to the sea surface. Charted depth 1.2 m, from the chart datum line down to the top of the bar. Draught 1.8 m. A gold arrow with a question mark spans the gap between the bottom of the keel and the bar.
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1.9 m. Depth of water is charted depth plus height of tide: 1.2 + 2.5 = 3.7 m. Take off the draught of 1.8 m and there is 1.9 m under the keel.
