Companions' search successful due to visible clues...

Companions would instinctively do all the right things to locate and extricate their buried friends as soon as something was visible at the surface.

In the winters of 1994/95, 1996/97, and 2003/04, it was even possible to rescue every single person buried under avalanches (100%) and located by their companions as a result of incidentally visible clues. source of data: SLF/Davos

The logical consequence

A piece of equipment that will reliably stay at the surface of an avalanche, be visible from far away, and lead directly to the buried persons via a connected cord.

This way, anyone in a group would be able to find and rescue one's buried companions immediately.