Neither are special licences, registration or an MMSI number or desktop connectivity required. The unit boasts five-year battery life with user-replaceable power-cells, is depth-rated to more than 140m and is said to transmit its GPS location (accurate to within 1.5m) to vessels up to 34 miles away. The introductory price-tag is £175. .

www.nautiluslifeline.com

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