I like the idea of having it as a ship upgrade, but even as a fairly new player, being able to see the lanes seems like it would be helpful in deciding what planets to drop on.

Maybe that upgrade could sort of be a part of the tutorial? Like, you learn what samples are, pick up a few (maybe five-ish), and then the first time you open the ship upgrades, it walks you through buying your first module with the conveniently low-priced “Galactic Positioning System Premium Subscription” or something of that ilk. That way, it could sort of kill two birds with one stone, teaching newbies how to do ship upgrades while giving the map a bit more functionality.

(Edited for grammar)