ViragsSocial

Can see guild roster location.
Other players don't need to have VS.

How it works:
You open guild tab and with /who help VS knows location of 50 online players of your guild.
If you have more then 50 players online, you still can try to load untracked players location info, by clicking on their row in grid.
Loading individual players location works in circles too.
But you can load only 1 person every 3-5 secs.(This limitation comes from how often you can use /who)

Probably there is a better way to implement this. Still looking for the best design solution for this feature.