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They are the arrow keys .
Clearly, the most important navigational tool available to sailors before was the Stella Maris.
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The sun and the stars.
Amerigo used the Astrolabe and the Quadrant
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The navigator led the pirates to pure success.
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He used celestial objects and compass.
Leif Ericson is not known to have used any navigational tools; no compasses, sextants, or maps, yet somehow he knew where he was going. How he and his countrymen accomplished this is still discussed, but not known for certain.