Re:Collission
They make GPS units for the blind and they go to great pains to point out in the manual (HTML for computer speech access) that it is only to aid with "orientation" and isn't a "primary mobility aid." For everyone else your eyes are your primary mobility aid, as such the prat in question was obviously looking at the GPS when he should have been looking where he was going.
Don't blame the GPS, blame the pillock who wasn't able to concentrate on where they were going while checking the GPS from time to time. "I was following the GPS" is no excuse for a collision.