Prior to the missions update, I would have a couple o2 tanks, three small wind turbines, and a battery to support the portable oxygenator. Two of the small turbines would be on the terrain tool (not sure if it is a bug that they work there). The qt rtg reduces that figure to just a portable oxygenator and a qt rtg. I was able to acquire both prior to getting o2 tanks.
I'd complain about that making things too easy, but tether spam already did. Same case with the new compass. On the plus side, I do not need to wreck my performance with tether spam anymore.