Project Description


and Radar Reflectors

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Hydrosphere offer a variety of topmarks and radar reflectors designed to be mounted on buoys and fixed structures. A range of sizes and configurations are available to suit all applications.

Marine grade aluminium topmark radar reflectors 
These topmarks double up as radar reflectors and are recommended for most applications. Available as cylindrical, conical, spherical, special mark, isolated danger and cardinal configurations and in small, medium and large sizes.

Polyethylene topmarks with internal radar reflector
Light, compact topmarks suitable for smaller buoys that cannot carry a larger radar reflector or topmark. The topmark is constructed from polyethylene with an internally fitted marine grade aluminium radar reflector.

Herikon plastic topmarks
These flexible plastic topmarks are used for larger buoys that need to withstand the most harsh marine environments.

Polyethylene fish farm crosses
Available in small and large these topmarks are designed for fish farms posts and buoys. An aluminium radar reflector can be mounted on the top along with a self contained navigation light.

Marine grade aluminium radar reflectors
For small buoys that already have a shaped hull / daymark floats a radar reflector can be used in conjunction with a polyethylene topmark.

For more bespoke applications please contact us.

Hydrosphere Top Marks


  • Marine grade aluminium radar reflectors
  • Polyethylene topmarks with and without internal radar
  • Flexible polyethylene topmarks for extreme sea conditions
  • All topmarks / radar reflectors are suitable for fixed structures
  • Available for 1.2m to 3. diameter buoys
  • Suitable for a variety of buoy mark configurations