As you have have probably gather by my previous two questions, I am new to all of this!! I am using the latest Raspberry Pi Image. For any updates to this image do I just issue a sudo apt update and a sudo apt upgrade or do I have to install them manually?
The system you can update if you want. The feed client and ADS-B stuff doesn't really have a good update functionality as of yet but it's usually not necessary. You can update tar1090 if you want: https://github.com/wiedehopf/tar1090#tar1090 You can also update readsb / the feed client with a fresh compile: https://github.com/wiedehopf/adsb-wiki/wiki/adsbx-image-update-readsb