You can always lock the ship you want(you must do this to get the stadimeter to work), then use the stadimeter to get the range. In this case, insted of lining the waterline of the ghost image to the mast of the real one, you look at the range dial on the right and then adjust the range by moving the ghost image up and down until the dial points at the correct range. Then you send it to the TDC as usual. Note that you don't need to identify the ship, any preset mast height will do since you won't be looking at the periscope anyway.
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