Isle Royale

NPS warns that cellular service is unreliable and emergency response is slow. A functioning marine VHF, current paper/offline navigation and a reliable emergency communications backup are far more important than normal phone reception. Check the crew's actual radio, satellite communicator and emergency procedure rather than assuming a signal from any cove. Time zone at the island is Eastern Time; Grand Portage in Minnesota is Central Time, which can cause charter departure misunderstandings.

English is the working language for NPS visitor centers and the verified commercial operator. There is no source-backed assumption that underwater briefings, rescue coordination or ranger services are routinely available in other languages.

Consider dive-specific accident cover that explicitly covers cold-water wreck diving, planned depth, decompression/technical profiles if applicable, medevac and distant recompression treatment. Standard travel policies may exclude these exposures. The charter operator recommends specialist dive accident insurance, while the NPS emphasizes long evacuation times. Confirm policy exclusions in writing before paying for a charter.

For scuba: trained drysuit system, suitable undergarments, hood and gloves, cold-water regulators, inspected cylinders where needed, regulator spares, lights, line-cutting tool as trained, dive computer, redundancy and vessel oxygen/first aid. Follow the NPS invasive-species cleaning instructions before arrival. For non-divers: layered insulation, waterproof shell, suitable shoes, headlamp, insect protection, reusable water containers, approved food storage and extra medication/food for marine delays. Lake Superior forecast preparation and a reliable map matter in every month. A charter bunk typically has limited luggage space, so confirm the operator's exact gear checklist.