The name of the next road and your current road are stacked at the bottom of the interface, with the distance to destination and expected time of arrival just above. The Lane Assistant Pro information pops up above this. A symbol showing your next turn sits on the left, with a smaller symbol showing the turn after that, which is helpful when the two occur in rapid succession. Despite all these on-screen elements, there's still a reasonable amount of space for the map itself.
Performance of course depends on your particular smartphone, its processor, screen size and graphics response. Our test device was an HTC Touch Diamond with an external Bluetooth GPS receiver. Whilst screen updates were a little more laggy than the standalone Navigon devices we have tested, we still had no problem navigating. The voice commands were clear and directions appeared in good time. Overall, aside from the smaller screen on the HTC phone, it wasn't significantly more difficult to navigate with MobileNavigator than other Navigon devices we've tested - so perfectly adequate to get the job done. Since the software has a pedestrian route profile option, you might find yourself using it when not in a car as well.
Navigon's MobileNavigator 7 isn't the only software available for turning your smartphone into a sat-nav device. TomTom's Navigator 6 offers similar features and costs about the same, or there's Wayfinder Navigator 8. Whichever you choose, you will need to factor in a kit for mounting your phone in the car and a charger cable, usually at least £10-15. So a standalone sat-nav could still work out costing a similar amount, and will probably be less hassle to use for frequent journeys. Nevertheless, we had no complaints about MobileNavigator's ability during testing. It's well worth considering if you do want to save on the gadget clutter, and turn the smartphone in your pocket into a part-time sat-nav.