On 28/12/2013 20:52, John Williamson wrote:
On 28/12/2013 20:39, wrote:
dennis wrote:
The satnav may know which roads are closed, the map wont.

How does a satnav know that roads are closed? A satnav is
simply a map that knows dynamically where on the map it is,
it isn't psychic.

Some satnavs have a receiver for live(ish) traffic and road information.
It's normally piggybacked onto classic FM, IIRC.



Mine runs a data connection and is pretty good at knowing what the
traffic is like and where the hold ups are.

It gets data from the road sensors and from other satnav users out on
the road.