I have it and i've used it and it works. It also has an integrated digital compass, different settings for the display where you can darken the back and lighten the letters or vice versa, also has a mini two function trip computer where it tells you total distance driven and i think either avg. mph or something else. Also it has a feature that it'll tell you the exact roads you are at or driving through or on.

However it is kind of archaic in presentation because your only visuals are arrows and a voice but it gets the job done in the space DC had to do it without having to rearrange all the row of buttons in putting in a larger unit with a large display. I think it works great for the compact design it has and also the only flaw is that after not in use for about two weeks mine automatically resets requiring you to reinsert the NAV CD-ROm and reloading it again.

Also the stereo has other settings not available on the standard unit as well as an estimated time of arrival audible feature.