If you haven't been satisfied with the glut of 3.5-inch and 4.3-inch portable GPS units that have hit the market in recent years, take note: Magellan is looking to kick things up a notch with its 5-inch Maestro 5310. The $599 unit approaches the size of built-in car navigation displays and also offers AAA TourBook and roadside assistance along with multi-segmented routing.

Craig Ellison found in his PC Magazine review that it's not as good a value as other Maestro units, however. The device lacks some of the features that the less expensive models have, such as a Bluetooth phone interface and the ability to issue voice commands. It also doesn't have any auto-zoom or auto-volume features, and for some reason, Ellison's test unit had a penchant for recalculating his route even when he was following it to the letter. Check out the complete Magellan Maestro 5310 review for more details.