If you look at the picture at the top of the page, in the top right you have the equipment for determining a ship's course and speed. In the top left is a grey button which creates a double image to estimate range with. Drag the second image so that the waterline meets with the top of the mast in the normal image.
Note that this will only work If you have locked onto the ship and have identified it using the recognition manual.
There are guides in this forum that explain each step in making a successful firing solution.
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Rest in peace Dave
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