The links mentioned above is from Ontario of Ministry of Transport, is very clear, especially:
Drivers can still use "hands-free" devices:
A cell phone with an earpiece, headset or Bluetooth device using voice-activated dialing. Drivers can push a single button to activate or deactivate a "hands-free" function, as long as the device is mounted or secured (for example, in a mobile phone mount attached to the dashboard by Velcro or in a cup holder).
The screens on GPS devices may be viewed while driving, provided the device is mounted on the dashboard or secured to another place in the vehicle (for example, on a GPS windshield suction mount not blocking the driver's view, or in a GPS dashboard mount). Typically these units issue voice commands and drivers must input the required information before they start driving.
Again, how to judge that is NOT blocking the driver's view is quite subjective...
Most people will the GPS sucker sucked to the center windshield, can any paralegal gives some professional advice on this?? Is that OK??