Both Columbus and Magellan thought that they understood the Earths circumference, however this false understanding caused them to end up in the wrong place. Magellan, however, had a better understanding the world geography.
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There is no evidence either way.
YES
Ferdinand Magellan tried to kill islanders but on the way back to his ship an islander killed him.
Magellan even relied on the taste of seawater to guide the fleet.
Magellan didn't return. He died half way around the world at the hands of the Philippine natives.