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The magnetic compass
It's not map making skills cause they weren't trying to get there in the first place. They didn't even know it was there.
The compass helped the explorers in navigating across the oceans.
Christopher Columbus didn't discover any oceans, only a small island off the coast of the Americas.
no
There are MILLIONS of animals in the world's oceans. Explorers are still discovering new life forms.
These maps by this Greek cartographer guided sailors into unknown oceans.
Explorers Adventures of the Century - 2013 Stephen Redmond at Oceans Seven 1-3 was released on: USA: 23 February 2013
explorers
development of lungs
Sailing ship. It was the only way available then to cross the oceans.
A peanut butter sandwich and a compass