They had no sooner left the ground and headed over the large expanse of unbroken timber before Bill realized that he was going to find it rather difficult to accurately locate himself on the map. There was a strange similarity between the different sections of that area. The mountains were all covered with timber, roads were few, there were no railroads at all after leaving the immediate vicinity of the airdrome and the details of the ground all looked the same. He realized that he would have to orient himself by the rivers and streams or become hopelessly lost.