I haven't seen anything on Nav Points and recently I'm finding that working with Randoms in large and complex maps that being able to place Nav Points is extremely valuable. For one players will get lost and the geometry sometimes can be confusing. You missed a turn or a tunnel. The map is saying here, go here. But it's really above you or below your position that you need to reach and it's hidden from view. Players who can set down navigation beacons can be extremely helpful in these situations. Also doesn't hurt if you spot a container of interest to point them out. Hopefully the Ghost can help illuminate paths that you need to take on campaign missions. I was playing some Warframe and I noticed that by setting down Nav points to the extraction zone I saved two of my teammates by placing one on the door they needed to run to. I can see this type of passive communication between silent Randoms being very helpful.