Sample voices are available in the MAPLUS website.
Furuya Tohru (古谷徹): "On the right! I'm sure it's on the right!"
Ikeda Shuuichi (池田秀一): "Go ahead at an angle to the left. I won't let you regret."
Wakamoto Norio (若本規夫): "It's absolutely on the right!"
Ochiai Yurika (落合祐里香): "Maybe turn right... Yes! Surely to the right!"
Kugimiya Rie (ラティ): "The exit is over there. Shut up and get out of here!"
Ohtsuka Akio (大塚明夫): "Turn right! Don't think about anything else!"
Sawashiro Miyuki (沢城みゆき): "Hey, you have to make a U-turn soon. but what's U-turn?"
Wakamoto Norio would be fun, and I love Furuya Tohru XD He was so awesome at AX a few years ago. At his panel, he took voice requests, and would say stuff in whatever of his character voices you wanted XD
I think the closest we have to something like this is the Knight Rider GPS (which I also think is pretty awesome, lol)
But.. The idea of Kugi acting as the car navigator sounds rather strange. Do people even need such a device in the first place? Of course, I support the idea of making the navigation device because Kugi will have an extra part-time job. Life isn't easy during the recession.
However, I wouldn't buy a car navigation device though. (laugh)