I defiantly found a system map that showed an asteroid belt and the only way for me to get to it was to d scan it down. I am just wondering if you can find system maps that just show a sun but in reality theres planets and belts
Yep, you only have data on certain systems, the rest you have to explore or buy data on (which I don't think is working at the moment). The good news is that if you scan some stuff, you can then sell the data at a station at least 20ly away!
I've personally cruised around a system that had an asteroid belt somewhere on the system map. Eventually found it, but I had to fly around the sun, following the orbit lines and trying to imagine where it might be - asteroid belts don't seem to be visible until you're in one, at the moment.