I have a client that sends me a KMZ with waypoints. I have to go to them and drive a stake. I have been using google earth and google maps to locate the locations. i then use GPS Map Camera APP to take a picture of the stake with the coordinates on the picture to show it was placed in the correct location. My problem is when I am out of cell service for a long time the Camera App will not update accurate coordinates. It says offline. I have also had problems with Google maps showing map info. I was wondering if there was a handheld GPS that would do what I need without breaking the bank or if I should be using different APPS on my phone? Any advice would be greatly appreciated.