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 virtually everlasting •Betalite'. It has two range scales: 2-5-32 feet and 2-5-32 fathoms (Model A); 2 5-52 feet and 2-5-52 fathoms (Model B)and 0-7-9-5 and 7-9-5 metres (Model C). A 2J in. or 4 in. dia.

repealer dial is availablefor 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 HENGISTand HORSA wind direction and speed indicator.

where accuracy and reliability count: BROOKES & GATEHOUSE LTD and in (he U.S.A.: Bath Road, Lymington, Hampshire. Tel: Lymington 4252/3 BROOKES & GATEHOUSE INC., Woodland Building, Larchmont, N.Y. 10538, Tel: 914-834-0044.