Safe water marks

The Safe Water mark indicates that there is navigable water all around the mark; for example in the mid – channel.
A Safe Water mark has a shape of a spherical, pillar or spar, and is painted with red and white vertical stripes.
As a top mark it has one red sphere.
The Safe Water mark, exhibits an isophasing, or occulting white Light, or exhibits one long flash of white light every 10 seconds, or Morse A.
To memorize the safe water mark, associate the light -, single white flash with the shape, – single sphere.