Don't know and don't care. I just got a iva-w505 and will be getting the Navi P1 unit. I don't need Navi that bad like everyone else. I've been all over the US without Navi and don't recall getting lost to the point where I said to myself "****, I need to get a Navi unit". I've rode in other people cars that had Navi, and we still never used it. I don't care how it compares to other units. I've researched it and it can't be that bad, at least for me. Some even freak out and bash a unit if it doesn't have 3D mapping. I guess those people have a bad sense of direction? I'm hoping to use mine for ATM's, Restaurants, and residental areas with alot of turns.
I see all these people riding around with navi, but the same highways are still always jammed up. Who's using their navi to reroute? Garmin is the Sh!t, but the Kenwood ipod wise didn't meet my needs fully. Bottom line is that I had to have that Alpine sound first, and whatever navi went with it. I refuse to mount a portable navi on top of the dash. That's not Playa! I prefer the all-in-one units.