If your personal marked locations are fixed camera speed traps send in the locations to cheetah and they'll add them to the next database release, then you can adjust the alert distance down by seconds of warning via the user interface.
I use the Google earth pin to get the coordinates spot on then use the vector tool to get the direction the camera targets traffic. I then send that in with the street names and posted speed limit.
With my C50's set to speed and red-light cameras only now they are very quiet and a pleasure to use in my city.

