By allowing ads to appear on this site, you support the local businesses who, in turn, support great journalism.
Rudi Kiefer: Why your compass may not really be pointing north
Rudi Kiefer
When there’s no GPS available, an old-fashioned magnetic compass is a great tool for orientation. One problem is that the needle doesn’t exactly point north. The compass doesn’t know where the Earth’s North Pole is – that spot where all the meridians of longitude come together and mark geographic north.