I downloaded this useful app , I am not sure how much this is normally.
a3DTrack HUD +SpeedCams
a3DTrack HUD+ is an advanced vehicle digital dashboard featured by combined speed, location and altitude 3D log graph with HUD mode, IPOD PLAYLIST REMOTE CONTROL and FIXED SPEED CAMERAS DATABASE.
It visualizies your
maximum reached speed,
current distance to the trip starting point.
maximum reached speed (during the current trip or all your trips), maximum altitude and maximum distance to starting point.
Also it shows
color coded distance to the nearest known fixed speed camera;
it's speed limit (if known);
it's position, relatively to your moving track;