How does Brian get found in hatchet?

Answer 1

When Brian finds a radio transmitter in the survival kit of the wrecked airplane, he tries to use it, but thinking it doesn't work, tosses it aside. However, it turns out that the signal was found by a small airplane, who comes to rescue him.

Answer 2

Brian is found by a pilot who sees the signal fire he had created. The pilot spots the smoke from the fire while flying overhead and lands to rescue Brian.