Dreamzxtreme

Just got the z-1 put in the other day to replace my IVAD310. So far i love it even though i havnt had time to figure it out completly zet and the fact that the manual is the first radio owners manual i have ever seen that has had chapters. Any way, is there calibration that has to be done for the nav, the reason i ask is the fact that the speed sense is hooked up and i assume it is workin but the nav is a few tenths of a mile off, not much but i played with it on the way to work and it said i hadnt arived zet but i definetly did, it said i have 2 tenths to go. Do i have to calibrate it, or

I am goin to be purchasing a Z 1 in a few weeks and am curious about the ebrake bypass. I am asumming i will be gettin a post july model although sometimes tweeter has older unopen inventory. My question is if i remove the cell phone mute wire and use that for the ground, will that effect the blutooth adapter which i will also be buying. I removeing that wire will affect the blutooth, is there another wire that can be romoved and used without affecting the units operation. I will be running the Z 1 with the sirius reciever, ipod controller and blutooth setup. Any information would be