It provides important data on the high definition, anti-glare colour screen, as well as clear voice directions, allowing you to focus on your driving. You not only receive advanced distance warning to your next turn, you also have the reassuring Back-On-Track function returning you to your original course if you make a wrong turn.
A high-quality speaker delivers clear turn-by-turn voice instructions for reliable route guidance; large next- maneuver arrows alert the driver to the approach and direction of upcoming turns; a real-time progress bar and distance-to-turn information ensure users take action at the appropriate time; detailed junction maps help drivers make visible associations with their actual surroundings; and user-selectable data such as ETA, speed, current time, time-to-go and total distance can be accessed with the touch of a button.
However, my Navman has a chart which fills up the closer you get to the instruction given by the voice over, I never miss a turning because of that and the screen displays your next instruction as well as the following move which makes you more prepared. These aren't featured in the Tom Tom 300.
The difference is about £100. If you're on a budget Navman is great, if you're not going to miss £100 then Tom Tom 300 or even better, I'd find a sat nav that combines all the above features of the Navman ICN 320 and Tom Tom 300.
The only bad point i have for this system is that i can't seem to type in the full postcode, it lets me type i so much and then it starts asking me for the street or number of the address i require, i'm sure it would be much easier to type in the full postcode and let the Navman do the rest.
It may be me and my big clumsey hands that is cause of this problem but i have let other people programme the system and they all come back with the same bad point.
All in all a good bit of kit with the one bad point thats why i have given it a four star rating