Do you get a black screen with stars? Or is there nothing there at all?
It does require a browser that supports HTML5 canvas element. Canvas Supporting Browsers
The script generates a dot graph that I just copy/paste into the program Graphviz (using the 'neato' renderer). I've got plans for modifying the script once I get back from holiday vacation (next Tuesday) -- I'll update the list of locations, and explicitly put a list of excluded places in there (eg. places with permit required) and filter port distance < 1000 ls like I'm doing manually now, so it will be clear that the stations are excluded for a reason. Nobody wants to wait to travel 600000 ls; ain't nobody got time fo' 'dat.
Further, the big change I've been mulling over, is instead of picking the result with the largest minimum sell distance, to add average tons to the data & calculated expected profit ratio, given the distance. That way I'll be able to short-circuit the issue directly and choose the route that yields the most cargo at the best profit-distance.