You have a lot of alternatives in using a trainer:
- Select a trainer from the orange Trainer Box
- Train with the ghost of Time Trial
- Train with an online member in multiplayer
- Train with an AI in an offline race
- Use your previous recorded laps as trainer reference.
- Record an AI of your choice (Track/car combo) and use that AI as trainer.
Currently only the trainer from the Trainer Box (1) and your recorded laps/AI (5, 6) have all details of telemetry data available (shared memory restriction).