Question: If I turn the TruckPC off and start driving, will it record my drive time?
No, but once it senses that ignition is ON, the TruckPC will automatically turn itself on.
Furthermore, the TruckPC will detect the vehicle's movement. Since you're not logged in, it will be recorded as Unassigned Driving.
Drivertech's Technical Support Line: 866-331-8785
How the ELD auto-records drive time