Saw bits of that. Think Nicolas Crane did something similar walking the English Meridian many moons ago...there's a nice book he wrote about it 'Two Degrees West'....https://www.goodreads.com/en/book/show/1352462.Two_Degrees_West
Well. I stuck with viewing the whole thing (but like Tom Davies, had a necessary break in the middle.)
I like his spunk, as they used to say. I know he did his homework on Google Earth but I was amazed that he didn't come MORE unstuck at some point.