Hello all,
I have a couple of topomaps (scale 1:10K) on which a UTM grid is printed. The map datum is WGS84. But there is no north indication whatsoever on these maps -- ie no true north, and no magnetic north (* see footnote).
Now, I believe that it must be possible to calculate the (utm) grid declination in function of:
- latitude
- distance from the central meridian of the UTM zone
=> for the center of the map.
But I cannot find the formula to use. Anyone who could point me in the right direction?
Many thanks,
Chris.
(*) The reason why is simple: I bought them online from a "topomap poster print" service, and there is no legend printed on these maps; the only annotation is the UTM grid.