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Lads, can you explain how *exactly * they do not function? I have always thought that the problem with the ballast gauges was all of them showing the same thing... for example as already said: on the surface they show how tanks fill with and expell water due to waves but as far as I remember they all show the same filling/expelling - it looks like all needles are tied together. As I remember from sub's manual some of the tanks (like trim tanks) are not 'opened' by default to let sea water in, so at least some levels should be constant.
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