lumivyöryhälytin

A lumivyöryhälytin, also known as an avalanche transceiver or beacon, is an electronic device used by backcountry skiers, snowboarders, and mountaineers to locate individuals buried by an avalanche. It operates by emitting a radio signal that can be detected by other lumivyöryhälytin devices set to receive mode. This signal allows rescuers to pinpoint the buried person's location.

Modern lumivyöryhälytin devices typically use a three-antenna system, which provides more accurate direction and distance information, especially at closer ranges. When a person is buried, a rescuer will switch their device to search mode. The device will then indicate the direction and strength of the buried person's signal, guiding the rescuer towards them. Once the signal is strong, a fine search is conducted, often involving probing the snow to confirm the exact location.

Proper use of a lumivyöryhälytin requires training. Rescuers must know how to effectively search for a signal, differentiate between multiple signals if more than one person is buried, and how to use the device in conjunction with other avalanche safety tools like probes and shovels. It is crucial for all members of a backcountry group to carry a functioning lumivyöryhälytin, ensure it is turned on and transmitting before venturing into avalanche terrain, and to practice using the devices regularly. Regular battery checks and updates are also recommended to ensure reliable performance.