I got the big 15MB data zipped at this link:https://github.com/HarryDrones/NACA4Series/blob/master/GPGSV.zip
It fills the sky pretty good. One thing that starts to become better defined is the path for a few of the satellites. In the sketch glv posted I swapped the saturation value with the hue:
colorMode(HSB, 100, 32, 100);
If the SNR is low, then it is red, medium is yellow, and high is green.