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.
Leading Data
| NATO Stock No. |
1370-99-108-9192 |
| Dimensions |
67mm diameter x 152mm long |
| Gross Weight |
0.8kg |
| Power Supply |
Integral 1.5v LR6 AA alkaline battery |
| Explosive Content |
Detonator 0.6g. Composition 31g |
| Operating Depth |
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 |
| Fail-Safe Device |
Circuit to detonator rendered open circuit after approx 5 minutes immersion by dissolution of soluble pellet |
| Rad Haz |
No risk – whole device contained in sealed metal enclosure |
| Shelf-Life |
4 years at up to 44°C (Def Stan 00-35 zones A2 and C2) |
| Audible Range |
Up to 1.8km in still water |