www.mytopo.com
Go there, pull it up, and for $15 you can order either an aerial photo, or a topo map of the area you plan to hunt. From there, you can find all the funnels, pinch points, bottlenecks...whatever. It is absolutely the BEST tool there is for land you have never set foot on. With a topo and a GPS....you'll never get lost. Period.
Well......unless you don't know how to read one...that may be a problem. [8D]