How to cross the Earth's core in a straight line

My superhero generates a force field which lets him and his equipment sustain the extreme conditions found inside the Earth. He decides to travel from the Geographic North Pole to the Geographic South Pole by taking the shortest path, i.e., digging in a straight line inside the Earth core.

My question is how can he ensure that he follows follow a straight line to reach the South Pole?

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How to cross the Earth's core in a straight line

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