Like open up the map and just click and place a waypoint that you and your fireteam can see on the little minimap at the upper left. Just like the arrow that points to the objective. It seems pretty simple, I don't know why they haven't added that yet.
Just thought it would be pretty helpful
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I always assumed that they must have had some reason for choosing not to add such a standard map-system feature, but it would be wonderful if they would add it. Region Chests and List Sectors would be so much easier to track down.