If that is not supported in simulator, that will be very inconvenient to develop AR immersive apps before Vision Pro available. Hope apple fix this asap...

Can developer use WebXR supported WebKit in native visionOS apps?

visionOS apps can obtain geolocation data from CoreLocation. The document of CoreLocation has the answer: https://developer.apple.com/documentation/corelocation visionOS 1.0+ Beta is shown in the supported OS