A lot sucks with the navi on these units.

I also have the X930BT. I was having the same problem. The location of my vehicle was different from what showed on the GPS reciever. I changed to main GPS unit and also the antenna, but the problem still existed. The real problem is the vehicle speed sensor. If you go to the 3D calibration screen the MPH should to the same speed as your car is going.

and if its not how did you fix yours?

I had to connect the vehicle speed sensor wire the the correct location. The best place to find this wire is to take the speedometer panel out. When you connect it, reset the 3D calibration screen. When you drive, your actual speed speed should match the speed on the screen. A couple soucres gave me the wrong color wire, so make sure you don't get the wrong info.

Mine is connected and working better now that the unit is swapped out for a new one. I am still having problems with parallel roads. If I'm on a highway and I exit off onto a parallel side road it keeps me on the highway. or if I'm driving on a side road and I get onto a highway it keeps me on the side road.....

Does your correct speed match what's displayed on the screen? Try reseting the 3d calibration screen & you might even wanna try to do a master factory reset. Once you do that on the 3d screen there are 4 units, display, left turn, right turn, and 3d these bars might have to be fully charged before its calibrated 100%

I'll check the speed as for the reset I did that a few times. as I'm crossing streets the unit is fairly accurate. its the parallel roads that tend to annoy me. But I will check the speed if it matches up.

I'm having the same problem is there a follow up?