you can start fires with the batteries of the satellite phone, TV cam, or the light they give you. You can start fires with the camera lense if the sun is out. you can build a V frame and keep the fire going for 12 hours by having gravity feed logs to the fire. You gotta build a shelter over your fire and keep it WET, or it'll burn, sooner or later. Keep fire and sparks well away from your gear, hair, clothing. Heat the tarp shelter with big, flat rocks that you've heated in/near your fire. Bury them under your sleeping area. Primitives all over the world make a machete suffice for all their cutting jobs.