DSSA is the sure bet, but i got curious and checked. Like in Norma Arm for example (here where i'm at the time), went to Inara, filtered carriers in the data panel: there're like a hundred of them around the center of the region, starting from mere 800 ly and then up to a couple of thousands ly from the center. Most of them allow docking and i bet nearly every one of them feature Cartographics and Vista. So that's a way as well. They might move while you crossing another thousand of ly however. Inara also lists services available and docking access limitations, so you can check in advance. Other sectors might be less populated too, but anyway, was surprised, thought to find less.