And why are you so worried about GPS? What are you doing during the day that you aren't supposed to?
I agree with Scatch, if you are doing your job, you should have nothing to worry about. If it looks like you might be taking a little extra time say at a pickup then call in just to cover your . Always CYA. Everyday they are going to try the ol" what took you so long and why are you an hour+ over and do they not do that now? So, that is why I agree with Scratch, and so what if they have GPS. Just do your job and smile.