Nope. Absolutely not. GPS Sensors give you an approximate location within 3m radius best case. GPS is almost irrelevant to autonomous driving itself. GPS is 99% for navigation purpose.
This (what you meant to say...)! IMHO: Apple is not developing the Apple Car, at least not yet. Apple doesn't like to bother with certain stuff. We have seen this at TVs. No Apple TV screen so far. I'd say they are working on the software for autonomous driving, algorithms, AI,... I could imagine (this is speculation!) Apple realized that a real AutoPilot will have to undergo a lot of testing by authorities and probably need to be certified. At this point Apple may be able to sell just the certified autopilot hardware and software to other companies. As this is a huge safety thing, having a reliable & safe Apple autopilot would likely make a hughe difference when purchasing a self driving car. That said, Apple may easily build a self driving car after having the autopilot. The rest of the car is easy compared to the autopilot. But again, a car is not Apple's style. They prefer clean, sterile, maintenance free stuff that has a touch of luxury, perfection... A car with lots of moving (wearing & corroding) parts (chassis, suspension,...) doesn't match that profile. Although, in times of Tim, we never know...
A Tesla requires little maintenance- the motors are rated at a million miles, you don't use the breaks much because of regenerative breaking, all the buttons are software (apart from the stem controls). There are 18 moving parts IIRC compared to the hundreds of thousands for an ICE. Service tends to be tyres and windscreen wipers! So yes easy to build, low maintenance, and right up Apples street (no pun intended). The bigger issue is the charging network and battery production for mass market. Here Tesla has a clear lead. That is why I still tend to believe Apple will buy them.