Magnetic north is not fixed and, over a timescale of several years, drifts around by several hundred miles. On 09-Jan-10 19:47, Dave Guimont wrote: > At 11:37 AM 1/9/2010, you wrote: >> Randy, >> True North is used as a reference. Magnetic North changes with observer >> location and time. >> > > Art, what does mag north have to do with time??