I don't quite fully get it yet, when I tried it the Shkval would automatically snap to what it thinks is a target, in this case the vehicle or units in front of the building. When I moved the tracking gates anywhere near the building, it would automatically snap onto a target.
I'm probably doing something wrong, but haven't figured out exactly what it is yet :) Thanks for the reply in any case. Is there a chapter or section in the manual somewhere that deals with this specific way of targeting?