It seems like they must be, as that'd be the obvious solution. I wonder what the motivation for that rule is, and how soon it'll change.

Ages ago, they had GPS/INS systems and active suspension that would pick the car's tires up over known bumps in the road. They also had a few spectacular accidents possibly related to misbehaving tech of that sort and it also represented a disproportionate chance to spend money in an arms race, so F1 banned much of that. I don't see them likely going back on it.

What are they using to show the track location graphics? I just assumed they must be using GPS.

Could be equipment that the teams don't have access to the data from.