This made for a fun read, as well as a reminder on the vastness of space, and one of the techniques used to map it. Personally, what I'm really interested in is the measurement of apparent star positions relative to Earth with the use of the 4 Nomads - I don't know if they have been used for such experiments, but it would be informative and beneficial to future interstellar voyages.

By "apparent star positions", what I mean is the apparent position of the stars themselves in the field of view. Seeing as stars move throughout space just like everything else, it would be interesting to use the apparent positions and parralax given by terrestrial observations, and measure how much the same objects deviate from said positions at the probe locations; thus allowing for more accurate star charting. What their light doesn't show at one location, math can yield from both.