Yeah; I wish I knew the old coordinate system used back in the '30s, but, in general, you can also use basic compass bearings and airspeed. At the least it'd be less frustrating than trying to find stuff that's been out of print for 80+ years.<br/><br/>(remember: 0 degrees is north, 180 is South, and for changing elevation you use up angle and down angle, respectively)<br/><br/>It's a bit like a submarine, only bigger. (A good movie to watch, in that regard, at least, would be The Hunt for Red October)