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  1. Lesson
  2. Worked case
  3. Decide and practise
  4. Check

Unit 9 · Decide and practise

Waterways, coastal bars, mooring and anchoring

Know the waterway, make a careful bar-crossing decision, keep clear of restricted areas and secure your boat safely.

Exercise: Make the plan, then choose where to stop

Work through a coastal trip and a later anchoring stop. Practise the handbook's anchor-line ratios using the depths given here; you must still allow for tides, swing room and conditions on the water.

Step by step

  1. In open water, you meet large waves coming directly towards you. How should you handle this head sea?

    Show the solution

    Control speed and direction in head seas. Too much power can launch the boat; too little can let waves break over it. Keep enough power for steerage. Handbook, pp. 130–132.

  2. Three adults are crossing the bar in an ordinary powerboat. Who must wear a Level 100 or above lifejacket?

    Show the solution

    Everyone on board must wear a lifejacket throughout a coastal-bar crossing; the ordinary powerboat minimum is Level 100. Handbook, pp. 34, 136.

  3. On return, large breaking waves make entry too dangerous. What is the safe response?

    Show the solution

    Reassess the return. The handbook says to wait for improvement or look for safe harbour elsewhere. Handbook, p. 137.

  4. At a suitable sandy anchorage, water depth is 4 metres. Using the handbook's 3:1 ratio for this calculation, how much anchor line do you let out?

    Show the solution

    3 × 4 = 12 metres. Anchor from the bow, allow for tidal depth changes and swing room, and check that the anchor holds. Handbook, p. 147.

Now on your own

On another trip, you cross Sydney Harbour and later stop in a sheltered bay. Make each decision without help.

  1. Can you drift in the Sydney Harbour Bridge Transit Zone while waiting for a friend, with no emergency?

  2. You want a free public mooring for a short stop. Which buoy colour identifies that category in NSW?

  3. Instead, you choose a suitable anchorage. Put these actions in order.

    1. 1Check shelter, depth, seabed, restrictions and swing room
    2. 2Check your position against landmarks to confirm the anchor holds
    3. 3Lower the anchor from the bow and pay out line as the boat moves backwards
    4. 4Slow down and prepare the anchor and line with the other end secured

  4. The water is 6 metres deep and the current is strong. Using 5:1 for this calculation, how much line is needed?