Isolated danger marks
These are on, or moored above, an isolated danger of limited extent that has navigable water all around it.
The colours are red and black horizontal stripes and the mark is, when practicable, fitted with
a topmark of two black spheres, one above the other. If lit, the light will be white showing a group of two flashes. It may help to remember this mark by associating the two flashes with two spheres.
Some examples of the isolated danger mark are on the Prince George Bank off Indented Head, Wooley’s Reef at Frankston and Eagle Rock in northern Western Port. Isolated danger marks are not always positioned centrally over a danger and it is therefore advisable to refer to a chart and not to pass too close.
FI (2)
