Conventional P25 is in short, a non-trunked(if you don't know what trunking is, read about it here:
Trunked radio system - Wikipedia) P25(APCO-25 or Project 25, you can read more about P25 here:
Project 25 - Wikipedia), which is a digital mode commonly used among law enforcement.
Do you want to just scan Augusta? Or do you also want to scan Maine State Police?