radar reflector
in particular, sports boats made of GRP offer virtually no reflective surface for radar beams.
This means that these ships appear on the Radarbildschirmen of the navigation practically hardly or not at all seen are seen.
For For this reason, recreational boats must be equipped with a radar reflector so that they can be seen even in poor visibility, in fog and at night. are seen. A distinction is made between passive and active radar reflector.