John Smith wrote:
> How many admin boundaries, except country boundaries, can be actually
> verified with a GPS?
> 
> Unless the boundary follows a geographical feature, such as a river,
> these boundaries exist only on "paper"

That's a very good point and it leads on to something that I've been 
meaning to mention for a while:

Where boundaries are traced from out-of-copyright sources (e.g. NPE in 
the UK), and they're actually following another feature (such as a 
river) it would be extremely useful if the bit of the boundary that 
follows the river could have a note added to say so.  Then, when someone 
who's actually been there corrects the river or other feature they know 
to correct the boundary too.

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