Home | Marine Aids to Navigation | Lighthouses ALT 7 Onshore Beacons Coastal Marking Usual Application 45 m Max. Height The ALT 7 towers stand out for their prismatic body with internal access to the upper platform. There are two upper platforms: 1.2 meter diameter circular or 2.2 meter square. Made of hot dip galvanized steel and painted with a CM5 scheme in accordance with IALA recommendations, these structures are characterized by their great resistance to be exposed. The beacon is equipped with a security door and optionally with supports for energy equipment at the lower side. Request moreinformation about ALT 7 Onshore Beacons