FIRST-GENERATION SATELLITE COMPASSES WERE $15,000, WHILE THE SC33 WEIGHS IN AT A MODEST $2,595. CHRISTOPHER COLUMBUS was already a master navigator when, on May 30, 1498, he embarked on his third voyage of discovery. This expedition, however, which ultimately carried his six-strong fleet to Venezuela’s Paria Peninsula, provided lessons in magnetic declination and governing practices. As he sailed west, Columbus noticed that the angle between north, as registered on his magnetic compass, and north, as measured by his lodestar, was changing. Columbus likely understood that this angle fluctuated over time and with his latitude and longitude, and he definitely understood that navigational ambiguity wouldn’t be a crew-pleaser, so he factored corrective measurements into his dead-reckoning navigation. ¶ While his tactic worked, contemporary heading sensors greatly simplify navigation. For example, mechanical…
