If navigators knew what to look for, the sea was full of clues when land was nearby. Seabirds such as gannets, petrels, frigate birds and terns roost on land at night and feed at sea by day, and so are indicators of land. The sight of these birds on long voyages must have been cause for jubilation.
Using this item
Photograph by Lloyd Homer
Permission of GNS Science must be obtained before any use of this image.