A backstaff is a an early navigational instrument for measuring the altitude of the sun and hence calculating latitude.
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what did hernando cortes use on his voyage
"Captain John Davis invented a version of the backstaff in 1594"
a sword
no he did not use a mask.
yes
Hernando Cortes Sailed From Spain On Ships, The once there they burned them and used horses to get to Tenochtitilan
Hernando Cortes
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He used celestial objects and compass.
Hernando Cortes name is Hernando Cortes.