Finding the Unity Device:

The few walkthrough's I've seen always use the 
black hole to find the coordinates of the Unity
Device. There is another, less time consuming 
way, but it involves some trial and error. 

This will start assuming you have the Chodak 
isolinear rod, and that you have solved all of 
the puzzles to get you to the first meeting with
the Chodak (on Allanor). 

Talk to the Chodak, and convince them that you 
are friendly and only want information. DO NOT 
let them know you have an isolinear rod (this is
very important). 

They will offer to take you to their library to 
look up information. Decline their offer and say
you can find it yourself. 

Proceed to the right and find the right 
transporter coordinates (there are only one set - 
here's where the trial and error comes in...save 
right now!) - Once you find the right transporter 
coordinates (by using the buttons on the left and
top) you will find yourself in another room with 
a transporter. 

Walk out of the room and you'll keep walking until
you hit the security system. The system has motion
sensors and if you move you'll get hit with a 
phaser. Analyze the sensors with your tricorder 
and you'll find out the frequency they operate it.
Let Data or Geordi do this, and they'll figure out
to set the phaser at a certain setting to knock out
the sensors. Fire at the sensors once you've set 
your tricorder to the proper setting, and you'll 
knock out a few. Move quickly into the door at the 
far right, because they don't stay offline. 

Walk to the library computer (there's only one way 
to walk.) Use the computer and open the file on the
Unity Device. 

Here's the extremely important part. You must 
quickly, and I mean quickly grab your tricorder and
record the screen. The tricorder will save the map,
and a split second later the Chodak will show up 
saying "so you have an isolinear rod after all." 

Brodnack will go through a big speech and leave you.
Return to your beam in coordinates by using the 
transporter you came in on (again, you have to use 
trial and error to find the right coordinates. 

Hint: save before you try and keep coming back using
a different set. Won't take long). You will end up 
where you first were talking to the Chodak. Return to
where you beamed in, and beam up. 

After that, the readings you took in your tricorder 
will be analyzed by the computer and after a little 
bit you'll get the coordinates of the Unity Device. 

From there you're on your own! Try it, and have fun!