Mark of alone danger denote small area navigational threat surrounded with sailing waters. Top sign is in shape of two black spheres and white light ( flashes by 2 in group).
Mark of alone danger description:
*Mark on top
two black spheres above one another;
Color
black with one or more wide horizontal red belts;
Shape
What ever, but different from lateral marks; Recommended is post or bar;
Light (if exists)
white
Ritham
flashes by 2 in group
*Top sign of two spheres is most important characteristic of alone danger during the day, a should be used where ever it is possible; spheres should be as larger as they can be and clearly separated.
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