Home | Marine Aids to Navigation | Onshore Beacons and Towers ALT 6 Onshore Beacons Leading Lights Usual Application 50 mMax. Height ALT 6 towers are lattice structures designed for applications where they act as supports for sector or leading lights. They stand out for their easy assembly and stability. They are made of hot dip galvanized steel and are prepared to receive accessories such as day marks, energy systems or other auxiliary equipment. Request moreinformation about ALT 6 Onshore Beacons