Under the realism settings, you get the option to turn the WO on or off. Leaving him on costs you 3% reality, if memory serves. If you turn him off, all of the WO options are ghosted. If you leave him on, you can click on his options (or not) at your discretion. There's never any point in the game where you HAVE to use the WO, as long as you can do the calculations or estimations yourself.
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