I don't think the Gleason map is an accurate map of a flat Earth. When he applied for the patent the author was aware and in full knowledge that the map was just a projection of the spherical Earth. And he stated that in the patent filling. But, I'm not sure you're aware of this ... privately Alexander Gleason said that was the only way he was allowed to publish his work.

Nevertheless, I found it useful for modelling. For instance in regards to time zones, which only make sense on a flat level plane.

No, I don't believe the Gleason map is an accurate map of a flat Earth. When he applied for the patent the author was aware and in full knowledge that the map was just a projection of the spherical Earth. And he stated that in the patent filling. But, I'm not sure you're aware of this ... privately Alexander Gleason said that was the only way he was allowed to publish his work.

Nevertheless, I found it useful for modelling. For instance in regards to time zones, which only make sense on a flat level plane.