Yes, I would expect this to be true, however, if the C100 is going to be displayed prominently in your windshield, it may be appear from a distance to look like a radar detector, which may mean one would have to be prepared for a traffic stop and an explanation...But, in the end, I wouldn't expect it to be a problem.
As long at the gps antenna has a good line of sight to the sky, it can be placed in a discreet mounting location to minimize the above possibility, at least, that's what I would do if I were to drive through VA or DC.
Veil Guy