JRBCMB show where the deepest and safest water is by using a compass. They can mark: Where to find the deepest water in an area. The safe side to pass a danger. A feature in a channel (for example, a bend, junction or the end of a shoal). Cardinal marks have black and yellow bands with black double cones on top showing the different compass direction that identifies the safest and deepest water to travel in. At night, each type of cardinal mark has a flashing white light with different groupings of flashes (continuous, or groups of 3, 6 or 9).
The base is moulded in one-piece, strong,coloured, durable polyethylene – filled with closed-cell polyurethane andUV-stabilised for resistance to sunlight.
The strong, lightweight polyethylene buoytop is moulded in standard IALA high visibility colours and shapes to suit arange of installation requirements.
For superior night visibility, the JRB 1250navigation buoy may be fitted with a range of Sealite solar LED marine lanternsup to 5NM+.
Brass inserts provide a secure mounting fortop, tower and signs. A 316-grade stainless steel eyebolt passes through thebase providing a strong mooring chain attachment point. In addition, all hardware and fittings are316-grade stainless steel.