As a PPL with no helicopter or military experience perhaps I shouldn't be asking a question on this thread but I find most flying incidents have some relevance to general flying. The question I'm struggling with is as follows. Is the implication that the Chinook was cruising along and may have entered misty conditions which took the crew by surprise or off course so they went for a correction in heading and/or power setting which the allegedly faulty software couldn't cope with? I hope this isn't too naive and I'm not suggesting any fault on the part of the crew but why otherwise would the software be relevant to the crash?