I use a Globalsat DG-100. not a live feed but a recorder. Simple to use just turn it on and place it truck. You can set it up to moniter every second or what ever you like. At the end of the day you just down load it and look at it thru Google maps and you see icons that show you where they were and for how long the were in one place. Once you buy it, got mine from amason, you have no futher charges ever. My guys have had there jaws drop when I show them after asking where they were and soforth. This thing puts icons as they drive down the road, how fast and all. You save it to a file on your computer, something like (Ron12-1-2010) and you can go back to it anytime you want. If a customer calls you know for sure what time they got to the location and what time they left. We use this in our sweeping business aswell. I can pull up the map and look right at the center and see if they hit all areas or if they skiped parts. They cant argue with yes we did do that area. I just smile and say O REALLY, look at this. And boy do they look scared, got caught and cant lie about it anymore.