How did Lehi's and his family find their way through the wilderness?

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With a brass ball that told them which way to go

As my father arose in the morning, and went forth to the tent door, to his great astonishment he beheld upon the ground a round ball of curious workmanship; and it was of fine brass. And within the ball were two spindles; and the one pointed the way whither we should go into the wilderness. 1 Nephi 16:10