Question 1498Navigation General

The correct answer is C) It is 1200, 6 July. When crossing the 180th meridian (International Date Line) while steaming westward, the local date changes by one day ahead. Since the question states you are crossing the 180th meridian at 1200 zone time on 5 July, your local time would be 1200 on 6 July. The other options are incorrect because: A) It cannot be 1200 on 4 July, as that would be one day behind the given date of 5 July. B) It cannot be 1200 on 5 July, as that would mean no date change occurred when crossing the 180th meridian. D) It cannot be 2400 on 6 July, as that would be the end of the day, not the middle of the day as stated in the question.