The ALT 5 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 stainless steel, their heights are from 3 to 6 meters, 1000mm diameter for daytime use with beacons between 3 and 7NM.