I am interested in knowing more about the accuracy of the plus code.

I have been working with organisations who need to define locations for 
delivery and servicing applications.  We have been looking at "What Three 
Words" as well, but I prefer your system and licensing model.

I am assuming that your system is based on the WGS84 spheroid?

We are also hoping that we can add a fourth value after the "+" in your 
Code to bring the grid down to a 1mx1m.  Is that a possibility?

We also want to make provision for a process / system that is Geoid based - 
i.e. relative to specific tectonic plates.  Why is this relevant?  Our 
services are relative to real world places - i.e. places that are fixed to 
the Tectonic plates, not the WGS84 Spheroid - which as you know is fixed to 
observations external to earth - i.e. celestial bodies.  Given that the 
average tectonic movement is a negligible 2-3 cm per year, this may seem 
unimportant.  When the plate moves - as during or after earthquakes - the 
WGS84 coordinates will of course be different for the same place.  In some 
places, especially around the so-called "ring of fire" movements can be as 
much as just around 10cm per year with jumps of several meters during 
earthquakes.  Over a ten year period that makes a lot of difference.

So my question is this - have you considered how to future proof your 

Regards - Gabriel

Public site: http://www.openlocationcode.com/
Github project: https://github.com/google/open-location-code
Demo site: http://plus.codes/
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