How did people discover the Adventure Coordinates?

[Maegor]

I thought only five of them existed as GPSs? I knew that Lava Moon, Ice Moon, Mars Outpost, Meat Station, and Moon Museum / Ainley (not sure which) existed as GPS coords, but I had no idea how to find Solarium(for example) without looking it up.

Solarium is 99,85 and it is on the GPS list, so is the moon museum and ainley