I must admit I'd have thought that in the present circumstances that getting that right would have rated very high in strategic importance. Moreover, given the

I must admit I'd have thought that in the present circumstances that getting that right would have rated very high in strategic importance. Moreover, given the high density of shipping in that section of the world from the earliest days (and especially so its strategic importance during the Cold War), I would have imagined that those waterways would have been the best documented/most accurately charted of anywhere. As it always does, eventually the real reasons will leak out.