Originally Posted by Daverman

The Yaw Rate adjustment adjusts the Navi's response to the yaw rate sensors (gyros). These sensors return a variable voltage based on your turn rate. Most sensors have a bunch of jitter and asymmetric sensitivity (more sensitive one way than the other), and these adjustments allow you to compensate for them.

There are two adjustments: CCW (Counterclockwise - Left turns) and CW(Clockwise - Right turns). Adjusting the sensitivity towards the positive increases the sensitivity in that direction, and adjusting it towards the negative decreases (dampens) it.

There is a lot of jitter associated with the yaw rate sensors, so you always want to have negative (dampened) sensitivity. Positive sensitivity will cause your present direction to jiggle and waffle as you drive.

So how much dampening is enough? It should be just enough to keep your car icon tracking straight roads without jiggling about. I've found that about -1.4% is a good start on my unit. Set both CW and CCW to the same amount and drive around. On straight roads, your icon's direction should be steady and not jittering left and right.

Now to compensate left and right turn sensitivity, drive a straight road that has a right-angle turn (such as at an intersection). Make sure your icon is aligned straight as you approach the intersection. Make a 90-degree turn into the intersecting road. Your icon should track perfectly at the corner and you should end up heading precisely straight down the intersecting road. If your icon didn't turn far enough, adjust your compensation value towards the positive end. If your icon turned too far, adjust your compensation to be more negative.

That's it so far! I found that my TL tracks perfectly with the setting of CCW -1.3%, CW -1.5% (i.e. my Navi has a right-turning tendency). For the record, the car came with the adjustment at -1.0%/-1.0%. The icon jittered incessantly as I drove down the road. I took it to Superior for servicing and they hadn't had the first clue as to what to do! Thank goodness I'm a snoop and I've owned an Alpine Navi (basically the same) before!

Oh yeah: don't be too trigger-happy with the adjustment. Adjust no more than 0.1% at a time, and allow time for the system to readjust. Also, don't forget to press the Set button after each adjustment.