Thinking I had it all together this past weekend to get my friends involved. I could not get the GPS to work right. Mind you it had taken a long rest between useage. It was showing a 20 mile difference then the info on the web site. I knew it was a setting but for the life of me could not figure it out. Went to plan B... down load a trial ap to my phone and use it. It actually did fairly well. I guess I was the one struggling because my GPS let me down. The next morning they wanted to go back out. trial period was up so I went to my Garmin car GPS I looked like I was carying a lap top around trying to find cashes....But all went good. Many laughs and I figured out the setting and fixed them for this weekend.