I had the laptop with me, so while eating dinner, I used a topo program to mark the locations of the fin and engine. They were a good distance apart which was a good thing. Being so far apart made it easy to get a line on the wreckage. I drew a line connecting the two locations and beyond. I figured that the engine probably ended up at the end of the debris field, so the plan for tomorrow is to check out the engine, then head to the fin and beyond trying to stay on my line.