A sun mirror, also known as a signal mirror, is a simple form of heliograph that is used to draw attention to itself by means of distress signals over long distances. The mirror reflects the sunlight in the direction of the suspected partner and sweeps over this area several times. The sun mirror is also used in snow sports for sending alpine distress signals and in deep-sea shipping.
Gliders Racing
Wenn das Wetter zu schlecht ist, geht es am Boden weiter mit dem [Glider Racing]!