NavList:

What about Uber drivers whose livelyhood depends on GPS? I recently took an Uber on a rather long route. How frustrating. Several times we passed an intersection where, if I was drioving, I would have turned off to go directly to my destination. But the uber driver followed a long round about route with heavy traffic. He obviously did not have a clue where he was going and relied on his phone on the windscreen.

I have just thought......   do the black cab drivers in London stll take the "knowledge" or do they use gnsss?

David C