Unfortunately, there isn't a way to manually enter speed into the notepad. Fortunately, it is easy to manually input the speed into the TDC and then switch the TDC back to automatic mode, thus connecting it to the periscope again so that AOB and bearing are automatically updated as you rotate the scope. Once speed is input to the TDC, it will stay like you put it. Only time it will change again is if, like you said, the speed part of the notepad has a speed written down on it and you hit the "main" checkmark of the notepad.
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