Can't speak for the Toyota Nav unit, but I will vouch for Garmin units-I have extensive experience with a couple of different mobile units (276c, 476c, Zumo) and can recommend a couple of on-line retailers that have competitive prices and excellent customer service (nope, I'm not affiliated with them in any way other than being a satisfied customer). I don't know if it's appropriate to post it here, so pm me if anyone is interested in it...I'll check back in latest by the weekend
