Best GPS for Cab and Chauffeurs ?

As said the garmin 550 or above with a windscreen mount, the unit plugs n to your lighter socket has in built speaker and gives extremely good spoken instructions. Takes a little while to get the hang of it, but will do more that your ever likely to need. Mapping is as good as it gets, and to use just punch in a post code and edit the choices it comes up with. Most car / bike shop sell them so go and have play with some. Mine is 5 years old been all over the UK, Ireland, and the EU from Spain at the bottom to Finland at the top. You pays your money and get's your choice Bro.