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Indicator buoy

The core of the Buoy is constructed using a rigid PVC foam, from which the buoyancy is derived. This buoyancy core has an outer protective layer of glass reinforced plastic.

The upper portion of the buoy, which is visible above the waterline, has reflective sheeting applied. On the underside of the buoy there is an anchor plate assembly to which a mooring line is attached.

The buoy is stowed in a purpose designed well and is retained in place by positively buoyant covers. When these are released from inside the submersible, the buoy which houses a radio unit, ascends under natural buoyancy. On reaching the surface, the radio unit antenna deploys and a continuous distress message is transmitted, a flashing light is also provided by the radio unit. The Indicator Buoy remains tethered to the submersible at all times.

Modified Buoy NSN 2050-99-027-3022
Un-Modified Buoy NSN 2050-99-733-4126


Technical Specification

Buoyancy Core
Rigid PVC Foam Divinycell HCP 70
Outer Skin
Glass Reinforced Plastic
Weight (in Air)
220 Kgs ±10
863mm ±3
860mm ±5
Excess Buoyancy
160 Kgs ± 10
Current Payload
48 Kgs
Typical V.C.G.
Typical V.C.B.
Typical G.M.
Typical B.M.
Operational Temperature
-30°C to +50°C
Storage Temperature
40°C to +70°C
All materials resistant to salt corrosion and in-service fluids and contaminants.