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Sven Yrvind wraps two handheld GPS units and spare batteries in bubble wrap followed by two layers of heavy industrial aluminum foil to protect them from a lightning-induced electromagnetic pulse aboard his high-latitude boat build.1:13 The foil acts as a Faraday shield, keeping the backup units functional if the boat's primary electronics are destroyed by a strike. He notes the GPS units are difficult to operate — it took him roughly half an hour to locate the longitude and latitude display — but considers them essential last-resort navigation tools.0:20 Fresh batteries installed in 2026 are rated good through 2032.0:36 A phone is wrapped the same way and stored alongside the GPS units.1:32 Each foil package is labeled and bagged.2:33 The setup gives him multiple independent navigation backups: two GPS units plus at least one phone, all shielded and ready if primary systems fail. A Faraday wrap of bubble plastic plus two layers of aluminum foil is a low-cost method to store backup electronics against lightning damage on a long-range passage boat.

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