electronic aids to navigation DEPTH—by HECTA echo-sounder, as supplied to the R.N.L.I. This instrument indicates depth by pointer and scale, and illumination for night use is by the virtually everlasting 'Betalite'. It has two range scales: 2-5-32feet and 2-5-32 fathoms (Model A); 2-5-52 feet and 2-5-52 fathoms (Model B) and Q-7-9-5 and 7-9b metres (Mode! C). A 2 in. or 4 in. dia.

repeater dial is available for the helmsman. Basic price, with one transducer: £80 IOs. This is one of a range of compact hermetically sealed navigational instruments which comprise the HOMER and HERON radio and direction-finder, the HARRIER log speedometer and the HENGIST and HORSA wind direction and speed indicator.

where accuracy and reliability count: BROOKES & GATEHOUSE LTD and in the U.S.A.: Bath Road, Lymington, Hampshire. Tel: Lymington 4252/3 BROOKES i GATEHOUSE INC..Woodland Building, Larchmont, N.Y. 10533, Tel: 914-834-0044.