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Having read about the resentrecent foot traverse of Antarctica by Colin O'Brady I was wondering which means the polar explorers of former, pre-GPS times did useused to determine that they hathad reached the North or South Pole. Obviously, you cannot use a compass since it would guide you to magnetic north or south and not to the pole itself.

So what means havedid they been usinguse or (to make it a bit more open) could they have used?

Having read about the resent foot traverse of Antarctica by Colin O'Brady I was wondering which means the polar explorers of former, pre-GPS times did use to determine that they hat reached North or South Pole. Obviously, you cannot use a compass since it would guide you to magnetic north or south and not to the pole itself.

So what means have they been using or (to make it a bit more open) could they have used?

Having read about the recent foot traverse of Antarctica by Colin O'Brady I was wondering which means the polar explorers of former, pre-GPS times used to determine that they had reached the North or South Pole. Obviously, you cannot use a compass since it would guide you to magnetic north or south and not to the pole itself.

So what means did they use or (to make it a bit more open) could they have used?

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Charlie Brumbaugh
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Having read about the resent foot traverse of Antarctica by Colin O'Brady I was wondering which means the polar explorers of former, pre-GPS times did use to determine that they hat reached North or South Pole. Obviously, you cannot use a compass since it would guide you to magnetic north or south and not to the pole itself. 

So what means have they been using or (to make it a bit more open) could they have used?

Having read about the resent foot traverse of Antarctica by Colin O'Brady I was wondering which means the polar explorers of former, pre-GPS times did use to determine that they hat reached North or South Pole. Obviously you cannot use a compass since it would guide you to magnetic north or south and not to the pole itself. So what means have they been using or (to make it a bit more open) could they have used?

Having read about the resent foot traverse of Antarctica by Colin O'Brady I was wondering which means the polar explorers of former, pre-GPS times did use to determine that they hat reached North or South Pole. Obviously, you cannot use a compass since it would guide you to magnetic north or south and not to the pole itself. 

So what means have they been using or (to make it a bit more open) could they have used?

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Benedikt Bauer
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How do you know you have reached North or South Pole without GPS?

Having read about the resent foot traverse of Antarctica by Colin O'Brady I was wondering which means the polar explorers of former, pre-GPS times did use to determine that they hat reached North or South Pole. Obviously you cannot use a compass since it would guide you to magnetic north or south and not to the pole itself. So what means have they been using or (to make it a bit more open) could they have used?