Definition
Charted as a sounding over the obstruction, often with a wreck or rock symbol, and it governs whether a vessel can safely pass. A wreck whose least depth has been determined by sweeping or diving is shown differently from one whose clearance is unknown, the latter being surrounded by a danger line and treated as a hazard at any draught. Always compare least depth plus predicted tide against draught with a working margin.
Want to apply this on the water?
Ask Saily out loud for an example, a scenario or a simpler explanation.
Talk to Saily