Right now, the only way to enter in specific coordinates and bookmark them is to enter them into any of the CHAT windows. This gives you a link that you can LEFT CLICK (redirects to the F4 Map) or RIGHT CLICK (Set Destination, Bookmark, etc) on.
It would make more sense to have some kind of TEXT box on the F4 MAP itself where we can enter coordinates.
Example: a Friend wants to direct me to their location on the map, or to some location. They send me their coordinates (maybe via Discord or email or whatever). I currently have to go to the CHAT window in game and paste that coordinate in to get a link that redirects me to the F4 Map.