If you know that people are going to come looking soon,
your best bet is to find an obvious place and remain there until you are found.
Pick a spot protected from the elements –
improvise a shelter,
build a fire
The other main goal is to make yourself noticeable:
Flash mirrors or shiny objects. Aircraft tend to notice these signals the most easily.
First, look through the sighting hole and aim the mirror toward the sun
until a fireball appears on the mirror’s reflective mesh.
Adjust the mirror until the plane appears in the sighting hole, with the fireball on top of it.
Tilt the mirror back and forth to flash.
Lacking a signal mirror,
use an outstretched hand to line up the plane with the reflection off any shiny object.
Blow a whistle or bang pots. These carry farther than your voice
Build smoky fires during the day, blazing ones at night.
Use green, wet wood and dry wood respectively.
In open spaces, make SOS Markings with rocks, logs, etc…
geometric patterns with bright objects.
In nature, shapes like X’s stand out.