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in the oceans mainly meant at night for sailors to see
These maps by this Greek cartographer guided sailors into unknown oceans.
The Southern Cross a.k.a the Crux Cross is a contellation used by sailors in the Southern Hemisphere for navigation.
The Atlantic Ocean.
the pacific
These maps by this Greek cartographer guided sailors into unknown oceans.
Staying within sight of land
The South Atlandtic and The South Pacific.
The Atlantic
The Pacific and Indian Oceans.
Astrolabes and maps