The GoPro Hero 6 Black has an integrated GPS data feature that you can toggle on or off. However, you can only make real usage of that data if you use GoPro's Quick editing software which is absolute sh*t, IMO.use a cheap xiaomi camera but will have that in mind!! thank you!!!
If you're using the Go Pro with Quick, just use quick to place and adjust the overlay and then export it. Use the exported file in the editing software of your choice. If you only want the overlay in specific sections, import the original file and the export with the overlay then sync the two files. Make your cuts based on where you want the overlay to be displayed.I wondered how to get that to work, I might have a play and see if I can get it to work for me