Do we need lighthouses

Lighthouses and beacons are towers with bright lights that still use fog horns. They are located at important or dangerous locations. They can be found on rocky cliffs or sandy shoals on land. Also found on wave-swept reefs in the sea and at entrances to harbors and bays. They serve to warn mariners of dangerous shallows and perilous rocky coasts. They help guide vessels safely into and out of harbors. The messages of these long-trusted aids to navigation are simple. STAY AWAY, DANGER, BEWARE! or COME THIS WAY!