May. 10th, 2016

desperance: (Default)
So Mars no longer has an internal dynamo or a global magnetic field, though certainly it used to. I am taking it as read that the mere residue, the surface-scatter of magnetised rock is not enough to make a magnetic compass viable. So how would you navigate, on Old Mars in amongst all the canals and without benefit of satellites or GPS? By sun and stars and landmarks, sure - but what am I missing?

[EtA: assuming a 1920s British-Imperial level of tech and understanding...]

[EtA2; I suppose it's too much to hope that Mars' north pole also (currently) points towards Polaris...? *asks internet* Yup: much too much to hope. Sigh.]

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desperance

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