I need really only one logger in order to synchronize the data later with my photos. No route planning, map etc ... just a data logger. The device does exactly super simple. Turn it a, hang it around my neck, and when I'm done I turn it off again. Then as a USB device to my Mac, there it will be recognized immediately. About GPSies I walk the data format to ... done. The supplied software I have not installed, I as I said I do not need advanced GPS functions. For me exactly the solution I was looking for ...