From a practical standpoint, flying and sailing share quite a few skills that transfer well. Navigation is virtually the same, with highly detailed nautical charts of various scales usually oriented to true north. The use of GPS is just as prevalent on the water as in the air — and marine chart plotters owe a great deal to their aviation predecessors — but the savvy mariner, like the savvy pilot, retains knowledge of the old ways and uses those skills to supplement the new technology. The process of route planning and dead reckoning is exactly alike, with crosscurrents to be accounted for in place of crosswinds. Where the aviator might try to avoid high bits of land, towers, congested airspace and TFRs, the sailor plots his course clear of shallows, reefs, jutting headlands and the occasional buoy. In both cases, “What do I do if the engine quits?” is always a consideration (there are situations where a sailboat wouldn’t be able to merely sail out of trouble). One surprising difference: Outside of the United States, government-issued nautical charts are notoriously inaccurate, in many cases being based off century-plus-old British Admiralty surveys.