With GPS units spilling out of every nook and corner, it's not surprising that new ones are added to the lineup every other day. It's now the turn of Harman Kardon to add a few pieces to its increasing line. They are adding 3 new models, namely the GPS-310, the GPS-510 and the GPS-810. The common specs include a 4-inch widescreen display (a 4.3-inches on the GPS-810), along with text-to-speech functionality, 2GB of internal memory plus the GPS and PMP features. The GPS-510 includes real-time traffic info, additional video options, and support for SDHC cards, while the GPS 810 includes a wireless rotary controller, an FM transmitter, and built-in Bluetooth for hands-free calling.

The new Harman Kardon Guide + Play GPS devices will be available next month, with the GPS-310, 510 and 810 costing $350, $450, and $600, respectively.
Source