HowTo: Side by Side Map Viewer (Mac, iOS)(Historical Location Finder)

I stumbled upon this site while trying to enter GPS coordinates into Gramps Family Tree app. I have only used the Side by side viewer but the other viewers, in particular the Boundaries Viewer, look very interesting as well.
I use the side by side viewer to pin-point the historical locations that no longer exist or have had their names changed.
Here is how...

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