I did some goose chasing recently (looking for coordinates of a few places). Part of the problem is that at the same time you're looking for coordinates, you have to maintain certain altitude. So that you remain in orbital cruise, but don't start gliding. And when you finally find the coordinates and start gliding, you still may end up hundreds of kilometres away from the spot you're looking for. Unless you immediately crash-land. Or calculate the point and angle of descent very quickly (good luck). So I genuinely find looking for landmarks like canyons or craters much more practical, but it only applies to locations someone has been to before and bothered to share the screenshots or video of landing.
Yesterday I tested Captain's Log looking for some barnacles I haven't been to before and certainly it helps, because you get big arrows to point you to the place. Instead of tiny numbers to figure out. You still end up off by quite a bit due to gliding and the solution is fiddly, so I do hope this doesn't get imported into the game. It's still a great application and I'm grateful for the navigation effort too. Even though it's not perfect, it does help a bit, so thanks for that.
Still, the only solution to this problem is being able to search for coordinates using surface map and ability to place waypoints on it. So that we can make precision descent to exactly the place we're looking for. And we know the game does that on its own (for example, for PoI you've visited before). In all honesty, Horizons shouldn't be published without such a feature in the first place. And I don't understand the point of implementing the current "planetary navigation system", I'm not sure what developers wanted to achieve or what was their motivation. Unless it was designed by someone with ASD, in which case it should be redesigned. Like, yesterday.