FM Traffic Compatible

• Both the 660 and the 680 possess FM traffic compatibility. However, the 680 does not come with a receiver, while the 660 does.
  
  

MSN Direct

• The 660 does not come with MSN Direct, a service that provides drivers with real-time traffic updates. The 680 includes both MSN Direct and a receiver to enable the service.
  
  

Overlapping Features

• Both the 660 and the 680 include a base map, preloaded street maps, map-adding ability, storage space for 500 waypoints, custom points of interest, voice prompts and spoken street names. Routing options include auto re-route, choice of route setup and route avoidance. Both models are Bluetooth enabled and can download car-shaped icons to the device, provide a travel clock, currency and unit converter, picture viewer and calculator. They also include the following audio features: a headphone jack/audio line-out, an MP3 player, an audio book player and an FM transmitter.
  
  

Physical Similarities

• In addition to their overlapping features, the 660 and the 680 are identical in look and size. Their weight, display size, display resolution and dimensions are exactly the same, and what appears on screen looks the same.