Is there a checker for US National Parks?

Question

There are several challenges arouind the US for visiting National Parks.  Is it possible to create a challenge checker for them? http://coord.info/GC4K8CY is a local example.

Thanks.

Comments

No there is not. The problem is that the border polygons are need for the parks. And to create a checker that gives no false negative you need polygons for all parks.
It might be possible if their they are all correct in openstreetmap

Answer 1

Thanks for your reply.  I am not familiar with openstreetmap but will as a friend who may be.

Comments

I asked about this on a local Facebook geocaching page. They thought the openstreetmap NP polygons were accurate enough for this purpose.

Subsequently, Yaten posted .kml data for US NPs at: https://www.dropbox.com/.../NPS%20boundaries%20by...

Will that do it? If so, please consider the Pacific West.kml if you are willing to do one.  Thanks.