British Isles Coastline North pointer
Function for drawing a north pointer on a blighty map
No return value
Draws a simple North pointer on a map. The postion refers to the centre of the N on the pointer.
You can't use this with other high level plotting commands (such as
blighty() stores the mapping parameters from it's last invocation in an object called
blighty.mapinfo from which the position, and size, of the scale is calculated.
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