Bah. I don't have to know the difference.
What I do know is that the technology has existed for a number of years that would allow for maps, oh I mean charts, to be made current.
Why haven't those in a position to make the fruits of this technology available to commanders done so? Are they lazy? Are they ignorant?
Instead they take their failure and pass the blame down.
How many Admirals have said, "we made a mistake" and "We're behind the times"?