Other than the Tom Harrison maps I have NO idea what any of you are talking about. This is why I refused my daughter's offer to get me a GPS unit for Christmas because I would never know how to use it or be able to learn how to use it and if I did I would quickly forget how to use it. DISCLOSURE: I actually have a learning disability and have trouble reading and disgesting info.

But I can read a contour map & use a compass after 65 years of hiking Mt trails and off trail traveling so I will gladly stick with that. Please don't take me to task or say you feel sorry for me as I am almost 75 and feel I have lived a very full exciting life.