Sven Yrvind · vídeo

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Sven Yrvind retrieves paper charts accumulated over years, selects a working set, and transports them by bicycle to his boat in light rain, protecting them in a plastic bag.Watch At the boat, he cuts the charts down to 32 by 32 centimeter squares — roughly one foot by one foot — then folds them to fit a small storage compartment.0:47 He notes the folding stays under seven times, referencing the mathematical limit on folding paper.4:35 On navigation redundancy, he dismisses the sextant as impractical for solo use: a four-second timing error produces a one-mile longitude error, and a sextant also requires tables, a nautical almanac, and plotting tools.2:35 He carries a spare GPS instead, reasoning that simultaneous failure of the US GPS, Russian GLONASS, European Galileo, and Chinese BeiDou systems is so improbable that if it happened, civilization's problems would dwarf his own.3:20 His conclusion: multiple redundant satellite systems make sextant navigation unnecessary for his purposes.4:14

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