Wow, what a nice mechanic! I really felt like a cartographer after I figured out how to triangulate myself properly (thanks to your video lol).
I feel like this could well be expanded into a full game - maybe with some kind of narrative or other things to discover at the different locations?
Also I would be interested in how your map mechanics are constructed! How do you update the texture? Also it became kind of buggy when I went onto the ocean to discover the north-east part of the map :D
Very nice game! Well done!