Hi lancemitrex,
I’m not using my customisations any more. Instead, I have switched to the dump1090-mutability package which is more advanced and also has a distance column. See here for details: http://discussions.flightaware.com/ads-b-flight-tracking-f21/raspbian-ubuntu-packages-for-dump1090-mutability-available-t19619.html
The developer obj is quite active on this forum here and actively develops his code.
Regards,
Marcus