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There is a resolver or potentiometer on the SUS (steering) unit that tells the computer where the drive is, and that angle is also available on the display at the helm. If that resolver goes bad, you will get a steering fault code and will not know where the drive is.
The trick with the little manual wheel is to crank it all the way to one side, then count the number of full turns it takes to get it to its opposite limit, and finally turn it back half of that number and the drive will be facing straight forward. 36 full turns from one limit is what I recall will get the drive centered, but it has been awhile since I had to do it.
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