Similarly, if you are using CarPlay, it will use your car's GPS instead of the built-in one. I figured this out when my car's GPS developed a fault which often gave a lock hundreds of meters away from my actual position, and my phone did the same thing when connected via CarPlay.
Cars also do dead reckoning with wheel and steering data so you get pretty decent data in tunnels where basic GPS fails.
Could you expand more on this? Very curious what this means/how it works
Most headunits with Carplay require you to have the vehicle speed sensor connected to them. They also have a compass. So, if you lose GPS, you have the 3 components you need for dead reckoning: A starting location, a heading, and a speed. It works pretty good even in complex areas like parking garages.
Does not seem to be the case for bmw g30/31 (5 series). The onboard satnav works in tunnels and does not think I'm driving down a side road, but CarPlay does...
Hmm, there must be a lot of cars without their own GPS then, or maybe apps can choose to use it or not? When I use Waze with rental cars I often see Waze responding to my phones orientation when CarPlay is active. Unless Waze is using orientation just for visual and the GPS is used for the position