Can the GPS system be updated
Yes, but expect a charge and usually has to be done at the dealer for factory systems.
Updated or upgraded. I regularly get offers to update our Acura nav system. Normal about $200, on sale about $100. I did it once and it took about 4 hours of the car idling loading the software. It appeared it was more tuned to restaurant updates than roads and wouldn’t do it again. Roads that had been rerouted weren’t on there and showed me driving through a field instead. I believe mine is Tom Tom based so maybe that’s the issue and yours may be different.