Final answer:
The lowest level of automation among the options given is VOR, which requires more pilot intervention compared to LNAV, RNAV, and INS.
Step-by-step explanation:
The lowest level of automation referred to in this context is VOR (VHF Omnidirectional Range), which is a type of short-range radio navigation system for aircraft, enabling them to find their position and stay on course via signals transmitted by a network of fixed ground radio beacons. While LNAV (Lateral Navigation), RNAV (Area Navigation), and INS (Inertial Navigation System) represent higher levels of automation and technological advancement, VOR is considered the least automated because it requires more pilot intervention and monitoring compared to the other systems that allow for more automated flight planning and navigation.