Additionally, a guy can do the same excercise on every glider flight he makes. While even thermaling at height a guy can look and see where he thinks he maybe could put her down then later take a closer look at a google earth shot of that same field and zoom in to whatever altitude he wants to check it out. While not being able to see rocks in the field, the google earth shot does show the hedge rows many of the wires, their support poles and the field slope. This is a great and pain free excercise to help a guy on off field decision making.
Dan