Congrats on getting into the program. I'm a newly graduated PCP- still looking for employment unfortunately.
Anyways to answer your question, I know Toronto uses GPS for navigation. I'm pretty sure Peel doesn't though. Like you've been told, it's something to get used to. I'm from Peel region so I'm fairly familiar with the area, however I have like no experience driving in Toronto, and I was worried about the same thing.
You're also right, the demand for PCPs is in a slump right now I was successful through the centralized process and had 6 interviews with GTA services, but I figure the interviews are what I messed up because I didn't get a job offer. I don't know if there is anything "extra" those services look for.
Good luck with everything,
MedicMal