Q: How are traffic conditions delivered to my GPS device or cell phone?
A: Data can be sent to your cell phone or personal navigation device in one of four ways: Radio Data System–Traffic Message Channel (RDS-TMC), General Packet Radio Service (GPRS), satellite radio, or MSN Direct.
Clear Channel’s RDS-TMC network is the largest in the United States, and this FM sideband technology is the most popular traffic data delivery method. Information is sent from nearby FM towers.
MSN Direct compresses and decompresses data over FM sidebands. Its feeds also include such information as weather, movie times, and gas prices. This technology is available in select personal navigation devices from Alpine, Avis, Garmin, and Pioneer.
XM/Sirius satellite radio traffic services are used primarily in vehicle-embedded GPS systems and can be found in about 700,000 vehicles nationwide. But GPRS-connected devices allow for the best experience, since they are capable of uploading and downloading personalized data. Inrix powers the traffic data for AT&T and Sprint devices, while Navteq delivers the data to compatible Verizon Wireless phones. Traffic info is sent via nearby cellular towers.
			
		
 
	
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