Published online by Cambridge University Press: 11 May 2009
An event/time recorder is described which is contained in a sealed waterproof case, with no external electrical connections and which uses novel methods for communicating control and data signals, and for charging the internal battery. The instrument is designed to be used underwater for recording behavioural and faunistic census information. On return to the laboratory the data can be retrieved, stored and processed using a microcomputer. The instrument is uncomplicated to use, completely waterproof, of a size that is easily carried and robust enough to withstand hard usage.