Very neat! I was confused as to how the possible paths would lead me to France, or if I slightly moved my phone, Brazil. Then I remembered French Guiana - it might be worth adding awareness of things like overseas departments rather than just the parent country.

Also, it reminds me of this HN conversation I found fascinating a few years back: Finding the longest straight line you could sail without hitting land - https://news.ycombinator.com/item?id=16965650