If you're part of the group, you could see other group member's marked locations (the X's with light ascending from them) in different colours not unlike Fortnite.
I'd think being able to see marked locations of friends (and hovering over that marked location would reveal who it belongs to) than someone in a group would be a better option.
Although for groups, being able to teleport to someone that is in a group would be a definite plus. Be much easier for members within a group to meet up if separated by being in different realms.