If you have a certain compass heading you want to turn to there's an equation you can do to get the proper bearing to look at before hitting the '=' key.
New course - Current Heading (+ 360 if negative)
This means that you take the course you want to turn to and subtract the direction you're currently heading in. Your current course can be found by turning the periscoe/uzo to 0 degrees and hitting '='. Then if that result is negative just add 360.
So let's say you want to set a course to 045 degrees, and you find your current heading to be 128. 45-128= -83. Since it's negative we add 360 and get 277. Now just point your perscope/uzo at bearing 277 and hit '='. You'll now turn to the course you want.
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