I know this topic has been discussed numerous times. Once more can't hurt. I've just recently started geocaching with a friend. We have been using his Iphone. I purchased a Lowrance Out and Back GPS. I purchased it without doing any research and I am paying for it now. I have absolutely no idea how to use the thing, so that goes to show how technologically impaired I am. I'm sending it back and am now doing a ton of research on them, so much so that I am as confused as ever as to what to purchase. Any suggestions to help a beginner would be greatly appreciated. Also, Do you have to purchase maps seperately? thank you.