I’m a bit confused by the “Undistorted Location” dialogue…
The following screenshot shows, from top to bottom:
– projection centered to 0°N/0°E, undistorted location set to the same coordinates;
– projection centered to 0°N/160°E, undistorted location set to 0°N/0°E;
– projection centered to 0°N/160°E, undistorted location set to the same coordinates.
So apparently, the input “0°N/0°E” at “Undistorted Location” is interpreted as “center of the map”, while other coordinates are interpreted relative to the map center.
I don’t know of it’s a bug or if it is supposed to be that way, but in the latter case, I think the dialogue should mention it…
Apart from that: Nice feature, thank you!

Kind regards,
Tobias
Geocart 3.3.1 on macOS Mojave (10.14.5)