The ALT 3 posts are used as aids to navigation in and around ports and harbours. Not only do they support a lantern for night time beaconing, they also act as a day mark. They can be used with all of our lighting equipment and power systems, autonomous or connected to the grid. Manufactured in hot dip galvanized steel, their heights are between 2 to 4m, 500mm in diameter for use in daytime beacons between 1 and 3NM.