The map trade is interesting. Space has the same number of cities we do but we delayed our expansion by building GLH. What has he been doing? Exploring? Building troops due to a frisky neighbor? Not sure what gain we would get by trading maps. He would definitely get good scouting from our map. If Space had ill intentions, a map showing the route to our warrior defended empire might make us a tempting target. My instincts say trading maps right now too risky.
Global lurker ; played in Civ VI PBEM 4, 5, 15; DL suboptimal Civ VI PBEM 17