"Hecta" portable electronic Echo Sounder, consisting of:- 1) Instrument case with switches and dial, 2) Remote dial, 3) and 4) two transducers, and 5) and 6) brass fittings, from the Gipsy Moth IV, sailed around the world by Sir Francis Chichester between September 1966 and May 1967, by Brookes and Gatehouse Limited, England, 1965-1966 'Hecta' Echo Sounder 1965-1966
