Marine Sound Signal Mk.8
The Marine Sound Signal has been in service with worldwide Navies for many years. Developed for the UK Royal Navy as a cheap, safe, hand launched, surface-to-submarine signalling device for exercise and communication purposes.
The signal is supplied in a ready-to-use state requiring no services or preparation. To function, the signal is opened by peeling off the ‘ring pull’ lid. The safety clip is then removed by pulling a lanyard and the device is ready to be dropped in the water.
All safety features, the hand-operated safety clip, the hydrostatic pressure switch and the magnesium silver sea water electrolytic bridge, must operate before detonation occurs.If operational conditions prevent detonation the signal will ‘fail-safe’ after five minutes immersion.
|NATO Stock No.
||67mm diameter x 152mm long
||Integral 1.5v LR6 AA alkaline battery
||Detonator 0.6g. Composition 31g
||10.7 ± 1.5m
|Maximum Delivery Height
||150m above sea level (for helicopter delivery)
|Triple Safety Features
||Hand-operated safety clip, hydrostatic pressure switch and sea water electrolytic bridge
||Circuit to detonator rendered open circuit after approx 5 minutes immersion by dissolution of soluble pellet
||No risk – whole device contained in sealed metal enclosure
||4 years at up to 44°C (Def Stan 00-35 zones A2 and C2)
||Up to 1.8km in still water