Home | Marine Aids to Navigation | Onshore Beacons and Towers ALT 3 Onshore Beacons Secondary Beacons Usual Application 4 mMax. Height 0,5 m Nominal Width The ALT 3 onshore beacons are marine aids to navigation with a double function: to act as a day mark and also as a support for a marine lantern. 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, with a diameter of 500 mm. They can be used as day marks with a nominal range from 1 and 3 NM. Request moreinformation about ALT 3 Onshore Beacons