I would not touch another Road Angel with a barge pole. I bought the RA Navigator when it first came out 500 pounds plus - it never worked spent half its life going back and forth from Northampton. Within a year they had superceded it 4 times.
GPS is GPS and you can download the camera positions free now.
As for the sensors against Mobile camera's forget it and don't listen to what you are told about how they protect against the honest bobby with his laser gun. By the time your censors work - you are nicked my friend - believe me.
As for mapping - I have spent hours writing the Road Angel about when they are going to update the Road Angel Navigators Mapping as promised on their website. After threatening thwem with court action they did - it must ave cost at least a pound because half of Britain does not exist - and if you ever have to (GOD FORBID) do not ask it to take you to Haverfordwest!!
Sorry to rant but go elsewhere