Halley published a chart of magnetic declination in 1701, so the fact that a compass doesn't point towards the geographic north pole was already understood at t

Halley published a chart of magnetic declination in 1701, so the fact that a compass doesn't point towards the geographic north pole was already understood at that time. https://en.wikipedia.org/wiki/History_of_longitude#Magnetic_declination https://en.wikipedia.org/wiki/History_of_longitude#Magnetic_...