LETTERS

摘要

Your interview with Bob Brewin about surfers' mission to log marine data (28 November, p 31) struck a chord. Such measurements are already recorded by others using the marine environment. As a scuba diver, I log my dives - recording information enables repeat dives to be safely executed and gives proof of a diver's experience and their capabilities. The logs follow a standard form that includes dive time, depth, site information, location, date, equipment and weight used. It also records environmental information: air temperature, sea surface and often bottom temperature, wave state, current, surge and weather. For many years, divers have used dive computers to plan and execute dives, and these automatically sample and record the depth, temperature and decent and ascent rates.