Safe Water Markers

Sailing buoy, identifies that safe, navigable water is all around

Test Summary

136 Number of times this test has been taken.
93% The average score for this test.

Consisting of vertical white and red stripes, a safe water marker identifies that safe, navigable water is all around. Often used to mark the centre line, mid channel in a navigable channel, the point where land is reached or sometimes the best point of passage under a fixed bridge. They may also be referred to as fairway buoys and have the same characteristics in both IALA buoyage systems. Safe Water Marks will not be numbered but may include a letter to help identification.

Vertical Red & White stripes
Spherical, Pillar, Spar
Top Marks
If a top mark is carried it is a single red sphere
White, with a slow rhythm, either one long flash every 10 seconds, Isophase, Occulting or Morse Code (A)
Iso or Oc, L.Fl.10s or Mo(A)
Chart Symbol
Safe Water Marks - Chart Symbol


Taking a test can be a great way to build on what you have learnt already and build confidence before taking a formal qualification test. The Safe Water Markers test consists of 3 questions randomly chosen from a selection.

136 Total Tests Taken
93% Average Score
Take Test


Here's a list of the sailing terminiology used within this theory