The H-range of navigational aids includes, echo-sounders, radio direction finders—a new version of the Hecta, model F100, having a maximum range of 100 fathoms will be in production early in 1971— logs, speedometers, wind direction and speed measuring instruments, etc., all designed and manufactured by BROOKES & GATEHOUSE LTD Bath Road, Lymington, Hants. Tel: Lymington 4252 On Stand UF2 London Boat Show.