There’s a number of ways you can get the High Frontier map of the solar system if you don’t own the board game.
You can get a poster map from Zazzle - just make sure you order a big enough a copy and not a postcard. https://www.zazzle.com.au/new_postermap_3rd_edition_high_frontier_nov_2015_poster-228522866334726293
You can download the Vassal module at https://vassalengine.org/wiki/Module:High_Frontier_(3rd_edition)
There’s a good getting started guide for Vassal at https://vassalengine.org/wiki/Getting_Started
If you haven’t seen the map before, it’s really an incredible thing to look at