I'm trying to benchmark unguided imaging with my mount. In the guide module, with internal guider, I need to calibrate and then disable RA & DEC guiding to have the drift plot.
Is there any way to avoid calibration and just start plotting the drift? Is PHD able to do this?

thanks

With PHD2, if you've done a calibration already you can use the Auto-restore calibration option.
If you have never done a calibration before you would have to manually enter some calibration parameters or do a proper calibration. Otherwise it will automatically start to calibrate.
A proper calibration is needed if you want to see the profiles for RA and Dec as it needs to know how the camera is oriented.