A 100 dollar GPS tracker attached to airplanes, with about 20-30 dollars in subscription fees each year, and SAR responders are already on their way to wherever this plane is....
Reports indicate that villagers near Oksibil saw the aircraft crashed and contacted the authorities. So they have a good idea where the plane is.
But like UAV689 mentioned, the terrain there is very rugged. With poor weather and the fact that the SAR there can't operate at night, unfortunately it's a very bad situation for any possible survivors.