TomTom calls its dead reckoning feature "Enhanced Positioning Technology". Essentially, "Enhanced Positioning" uses an internal accelerometer to determine speed, and, at least in theory, provides map tracking even during intermittent GPS signal outages. We've seen dead reckoning before from other companies, and it's never really been all that effective. I'm reserving judgment on the DR effectiveness until I get my hands on a 920. Based on the GO 720's GPS signal strength (or lack thereof), the 920 will likely need all the "Position Enhancing" it can get.

According to TomTom, the 920's voice recognition features will allow the GPS to be operated via voice commands. Interestingly, the European version of the GO 720 already had this feature, but it was removed from the US version to further differentiate the 720 and 920 models. Magellan added Voice Recognition to the Maestro 4050 model earlier this year and results were mixed.

Other than the speech recognition and dead reckoning, the 920's specs include all the usual goodness we've come to expect in a GPS: 4.3" display, Bluetooth support for hands-free cell phone functionality, text-to-speech, SD card slot for additional memory, a docking station, RDS-TMC receiver for live traffic information (requires subscription); pre-loaded with both North American and European maps, and TomTom's HOME software.

TomTom's GO 920 should be available in September and has a suggested retail price of $550 (street pricing should be about $499). Look for the GO 720's price to drop soon after that.