Ha. I'd be interested to see anyone manage that.
On top of this, in central London it's pretty built up so SatNav doesn't always work in the canyons between buildings.
On top of this, in central London it's pretty built up so SatNav doesn't always work in the canyons between buildings.
The better informed the satnav, the less valuable that is.
Also, even if GPS signals are hard to get in London, navigation in a fixed city can be calculated in lots of different ways. Allowing for some regulatory limits, a company (or an experienced third-party) could scatter their own transmitters around the city as needed, figuring out which frequencies give the best accuracy.
I'm not sure if there's actually a comprehensive source for bus lane data - if there is, it would be really useful for motorbike users too (who can generally use bus lanes).