Just learned about plus codes as a replacement for geocodes.  

They are using them to give addresses to Navajo dwellings.  Pretty clever idea 
to condense a geocode to 6 alpha numeric chars.  (10 if there is no nearby 
community name)

Based on a base 20 numbering scheme.  

I wonder if this is better than zip _4?  It is shorter by 3 characters.  
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