i use Qc $peed Free that work with gps to calculate your speed vs the speed limit. So if you go over the speed limit it will show you how much ticket will cost and how many fines you will got....
Here in Quebec the difference between 158 km/h and 159 km/h is insane
158 km/h --->290$ and 5 fines
159 km/h --->630$ and 10 fines !!!!!!!