TMC/FM Traffic for GPS Navigators is an extra paid service which delivers to suitably equipped GPS navigators information about traffic conditions including heavy traffic, delays, accidents, road works, black spots and speed cameras.
Who provides this service?
In the U.S. Traffic Message Channel (TMC/FM), MSN Direct and XM NavTraffic are three prominent traffic service providers. Service features and quality varies between the providers and different locations. Areas of coverage need to be checked prior to purchasing a Traffic enabled automotive GPS navigator.
Live traffic to your GPS
The Internet connected Dash Express is the first model to collect live traffic data utilizing aggregated data from Dash Express users on the road.
TomTom’s new IQ Routes technology is the use of actual average speeds on roads, instead of posted speed limits for calculating the best route.
For further information about how GPS works, see the following article
