I reached level 5 Engineering and it offered to unlock a second specialization, so I chose Exploration. The Exploration Tech Tree unlocked, but none of the Exploration missions are available. The Advanced Training says to Open the PDA, but the PDA is open already - isn't that where I'm reading the words "Open PDA"?
I can't manually check any of the boxes. I'm stuck with only Engineering Mission 6, but i can't seem to activate any o f those either.
What have i done wrong or what am I missing about "Open PDA" in my open PDA and starting Explration Missions?