Thanks Ukonig, now i see why this happens. About the speed dial, McDonnel, i see it happening at rough weather but in your patrol the sea is calm, so it makes no sense. I am guessing there are some bugs. In my case, i calculate the speed, it gives me 5 knots and when i pass it to the tdc it's 0. Neither this makes sense but maybe there is an explanation and my lack of experience cannot let me see it.
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