Question 1

Charted depth 1.4 m, height of tide 2.0 m, your draught 1.8 m. Water under the keel is…

Accepted Answer

1.6 m — Depth available = charted depth + height of tide = 3.4 m; subtract draught 1.8 m → 1.6 m under the keel. Then ask whether that clears your chosen safety margin.

Question 2

A power cable is charted with 16 m clearance. Right now the tide is 2 m below HAT. Your actual clearance is about…

Accepted Answer

18 m — Overhead clearances are measured from HAT — the highest the sea reasonably gets. With the tide 2 m below HAT you have 16 + 2 = 18 m. Add a healthy margin for cables: electricity can arc before contact.

Enough water?

This lesson is part of a paid course