Is it possible to get external video source data to talk to the Inpsire GPS sensor so that the data is seamlessly georeferenced in the same way that it is on the Phantom 4 I currently fly? This would typically be for cameras which are not supplied by/through DJI. What if any hardware/software configurations would I need to specify on the third party camera?

It would most likely involve SDK, you can look into that option by reviewing the SDK site below:
https://developer.dji.com

DJI-Jamie Posted at 2016-12-12 19:00
It would most likely involve SDK, you can look into that option by reviewing the SDK site below:
https://developer.dji.com

thanks will investigate

fansb1811fab Posted at 2016-12-14 00:55
thanks will investigate

You're welcome, there's a lot that can be done with SDK and they even have thier own forum for things like this.