An avalanche transceiver - skredsøker in Norwegian, often called a beacon in English - is the small 457 kHz radio device worn under the jacket on every ski-touring day. In transmit mode, it broadcasts a continuous signal; in receive mode, it picks up the signals from buried transceivers and guides the rescuer to the burial point through a directional display. Every member of a serious ski-touring party carries one, and the morning equipment check at the lodge or trailhead is a non-negotiable part of the day.
The transceiver is one leg of a three-part system. The other two are the avalanche probe (a collapsible 240-300 cm aluminium rod used to pinpoint the burial depth once the transceiver has narrowed the search area) and the avalanche shovel (a metal-bladed snow shovel, plastic blades are not strong enough). Together the three pieces are the standard avalanche-rescue kit, and the technique for using them - the 3x3 method for organized group rescue - is taught in the avalanche awareness courses that the Norwegian guiding community treats as a baseline qualification.
For the international visitor on a guided topptur, the transceiver is provided as part of the standard equipment. The morning briefing covers the basic functions and the group practice drill. The deeper technical work - search patterns, fine search, multiple burial scenarios - is the guide's responsibility. The Norwegian Mountain Code is uncompromising on this: no transceiver, no ski-touring day. The guides we work with treat the rule as inviolable.