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Yes! The GTM-20 is a charger with a built-in traffic receiver. The charger plugs into the cradle for the Nuvi 660 and then the Nuvi 660 snaps into the cradle.
However to receive traffic with the GTM-20, you will need to purchase a subscription, either yearly or lifetime. The traffic receiver receives traffic information from FM radio broadcast stations, which broadcast traffic data.
Most traffic reporting is done over FM radio frequencies so it really doesn't matter whether it's rush hour or not, unless your GPS traffic receiver is being shielded by other traffic, but this is unlikely. You can learn all about how this is done at http://www.gpsreview.net/traffic/ If the traffic receiver is external to the GPS, like with the Garmin NUVI where it's in the power cord, make sure it's not near some dense metal that might be shielding it.
This happens in the USA because the traffic information is paid for by advertising unlike in Europe where we have to pay a subscription annually for traffic information. The only way of blocking the advertisements is to turn off the traffic information.
If the GTM-20 Traffic Receiver is functioning, you should see a blue diamond on the main screen and you should be able to find a traffic icon in the menu.
If the diamond is grayed out, then the traffic receiver hasnt locked yet. If the traffic symbol is completely missing, then yes it could be a problem with the traffic receiver or the cradle or plug that plugs into the cradle.
The Nuvi 6xx receives traffic information from the GTM-20 receiver through the plug that plugs into the cradle.
Check the information that came in your box. With my TomTom Lifetime Traffic and Maps, there was an "activation" number on one sheet of paper. I had to activate (per instructions) before I could enable the lifetime goodies.
The traffic mode of this device comes up as a radio station that tell you how the traffic in some areas are. The traffic receiver is integrated in the vehicles power cable. You will need some components to set it up. You will need
mini USB connector,
External antenna connector,
Vehicle power adapter.
Once you connect these components together, your gps will be able to receive information on traffic.
Then you connect it to your gps device, once there is traffic anywhere around your area, the gps receives an information. A traffic icon appears on the upper left corner of the map page. The traffic icon changes color to indicate the severity of traffic conditions on your route or the road you are currently driving on.
TO MANUALLY AVOID TRAFFIC ON YOUR ROUTE : ON THE MAP PAGE TOUCH THE TRAFFIC ICON -
TOUCH TRAFFIC ON ROUTE -
TOUCH THE ARROWS TO VEIW OTHER TRAFFIC DELAYS ON YOUR ROUTE .-
TOUCH AVIOD TO AVOID THE TRAFFIC DELAY
Hi. I have the same model. It does support traffic information, but only using the traffic cradle. The S80 is sold with the cradle as part of the deal. If you register your Navman online you will advised where to get the updates.