autopilot
noun [ U ]
uk/ˈɔːtəʊˌpaɪlət/ us(also automatic pilot) TRANSPORT
equipment on an aircraft or ship to make it continue to travel in the correct direction by itself without needing a person to control it:
To shut off the autopilot and free other controls, the pilot must enter the commands into the onboard computers.
on autopilot
happening automatically or doing something automatically, without having to think about what you are doing:
When your marketing is effective and running on autopilot, you can spend more time on the tasks you like to do.