I'm a first responder, I don't own a gps device but i'm very interested in buying one to use on my daily job. TomTom seems to be the right choice...

I'm looking for a non-expensive, fast, resistent and reliable model that I can update myself.
Weather report is not important/ needed, traffic information is also not important, coordinates are not used in the dispatch (we are dispatched to street names or neighbourhoods).
I'll need to fast attach the device to the window shield and fast remove it when on scene (there is already a history of on-scene gps device thefts in my unit, that's why we are using our own devices now).

Looking forward to your advices.