GoPro + Racechrono or GoPro + external GPS + Racechrono?

Currently I have used my Iphone to get laptimes with my iPhone. Now I'm planning to add video to the mix and I am pondering on what's the best option here. Is the GoPro GPS data reliabe enough? I read the tutorial and understood that I can pull the data at pits from the GP and leave the phone out.

But having heard about GPS probles with the GoPro I also pondered on an external GPS logger (for example Garmin GLO2). How would this setup work in practice? I link the GoPro to the Racechrono and it automatically syncs with the phone that is using GLO2 to get the GPS?
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