EGNX also changed during the late 80s/early 90s.
EGNR also changed fairly recently.
Also I read somewhere that the rate of change of magnetic variation has increased dramatically in recent years
70 years from now EGCC could well be using 01/19 Left and Right.
Oh by the way, if it helps, the next geo-magnetic reversal is, (like Yellowstone), running a bit late.
