Don't really see the point
Well, you should play more MMOs. Almost every recently MMO has it... so i guess there is a reason.
http://aggronaut.com/wp-content/uploads … ypoint.png
I think there's a way to send waypoints to people on your friends list, possibly your squad. Is that what you're looking for? R-click on a waypoint from the list in the map sidebar.
Sharing your previously marked waypoints is not the same since you have to previously be on the place to mark it...