Forty years ago as a Boy Scout, my hometown (Aberdeen WA) was 22 degrees different between true north and magnetic north. If you did not take this into account, you got lost. When I moved to Mississippi ten years ago, I tried to teach the difference between true north and magnetic north only to discover that they matched precisely in Batesville MS. There was no point in those youth knowing there was a difference, unless they moved. Magnetic north in Aberdeen was then 18 degrees from true north. I was relating this as a "those kids will all own GPSes before they ever need to know this" tale when I discovered that today Magnetic north equals true north is now west of Brinkley AR and moving west fast. Magnetic declination in Aberdeen WA is 16 degrees today. I feel old. I had never planned on North moving in my lifetime. Why post this in the environmental fora? All to often I see 'change' associated with 'blame' or more accurately with 'avoiding blame'. No one suspects the change in magnetic north in being man made. Feel free to embrace environmental change without blame. puts more emphasis on field strength, something I have not measured.