I am not sure if this is entirely possible, as my spherical trig skills are lacking. Would it be possible to determine the Lat and Long coordinates for a position on the Earth knowing the following. True North Pole is at 90°N Geomagnetic North Pole is at 82.7°N, 114.4°W Knowing the direction of True North, I can determine the angle separating the two at my position. The vertices of the spherical triangle would be. Point A would be the True North Pole. Point B would be the Geomagnetic North Pole. Point C would be my location. The sides of the spherical triangle would be. Line AB, or γ Line BC, or α Line AC, or β Side γ has a known length, the distance from the True Pole to GM Pole, which is 820.76km. With Earth's radius at 6371km, this works out to be 0.13 radians, or 7.38°. [itex]sin C/sin γ = -1.07703 = sin A/sin α = sin B/sin β[/itex] Correct? Seems to me the other lengths should be able to be determined, and then perhaps the coordinates of Point C. Is that possible?