Definition
The calculation of range against consumption, with a margin. Motoring endurance is usable tank capacity divided by hourly consumption, multiplied by speed: a yacht burning 2 litres per hour at 5 knots from 100 usable litres has about 50 hours and 250 miles. Good practice keeps a reserve of at least 20 per cent for headwinds, foul stream, manoeuvring and diversion, and applies the same thinking to water, gas and battery capacity.
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