Does anyone know if it is possible to get Core Location data on a MacBook from an iPhone ?
So either by using a Bluetooth connection between the MacBook and iPhone or using a USB/Lightning cable or a Wifi hotspot.
Note that the phone will only have a GPS signal - no wifi or mobile network.
I believe that’s not possible. (There is a similar situation with an iPhone and wifi-only iPad.)
What you can do is send location data from the iPhone using Bluetooth LE using an app such as “LE GPS”. (Note LE, not classic Bluetooth.) But the Mac (or wifi-onlt iPad) doesn’t understand that natively, so each map app on the Mac needs to add support for receiving it. I did that for one of my apps, but I believe approximately zero people have ever used the feature.