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Assertion (A): Charted depths are almost never less than the value printed on the chart.
Reason (R): Chart datum is set at approximately the lowest astronomical tide at the port.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

Both are true and the reason gives the safety margin, and negative tidal heights are rare. A significant negative surge can nonetheless reduce the depth below chart datum. Negative surges are a real hazard for deep draught vessels.

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