My old hand-drawn map on photocopied subsector copies, then taped together to form a quadrant and plotted trade routes. I do miss those physical crafty days, now we do everything on the computer. Looks better in some ways, but I feel we're sort of losing the ability to make our own universes and worlds. And I really like hand-drawn images more for some reason. While I suppose there is a surplus of environments, worlds and scenarios on the various game platforms such as DriveThru RPG, I don't know that people make up their own as much. For me, that was most of the fun. Especially in the years when I was not actually playing, but playing at: making up worlds, corporations, characters, and maps galore.
But I digress. My map had dozens of trade routes that, if doing a financial analysis, probably make no sense whatsoever. Those days we did not care as much, and the group I am with now probably does not either. So we'll just go with something that looks good and may not make much sense.
I will have a lot of time tomorrow as well (yay snow days!) so I may pull out the GURPS Far Trader book, work up all the GDP stuff as well, and then see about making a more realistic trade map.
I also found that, as great as it is, TravellerMap does not handle routes going to the same places well...my hand drawn map has several routes that parallel and overlap each other. All in different colors - I suppose I was trying to use all the colors in that colored pencil set! There are several other routes not shown. Plus I discovered missing worlds as well.