Find the navigational cards 2/3
You will now need to return to the area near the tram station. Take the elevator and go past the mess hall, Upgrade bench and the Save station ant take the small elevator. Resupply at the Store and go for the door marked Sleep block C. From there go to the basketball court.
There is a locker and a Text log describing the zero g basketball out front of the court, but before you start the mini-game try to complete the objective. Jump to the second platform of the court and kill the necrobabies. After they're gone pick up the second Nav card. Now you can try to play some basketball.
Find the navigational cards 3/3
The last card can be found in the Sleep block C commons, that you can reach by turning right after leaving the locker rooms. You might want to resupply in the main area. Prepare for the attack of the mantis that animates the dead bodies. You should focus on it before taking care of the rest of the enemies. Get back to your mission. Get to the sleep block C and open the door with the crew key. After leaving the elevator save the game.
Get to the bunks area - there's a storage to the righ, but you will need to expend a Power node in order to get past the door. It's worth doing since you there is a lot of various ammunition there, as well as a Large med pack which pretty much covers the expense.
Move the bunks using kinesis in order to open up the way forward. In one of the openings there is a Ruby semiconductor.
The bloody trail leads to the scene of massacre. One of the corpses is of a woman that shot herself in the head - look behind the crate next to her to find the Nav card and a Medium med pack. Before you pick them up prepare for a fight - charge your stasis, reload, heal yourself. Then pick the card up.