Line Producer vs. Unit Production Manager vs. Production Coordinator vs. Prod. MGR

As someone who has done a number of low budget indie films where I practically do a little bit of everything and anyone who helps is typically a producer or production manager, getting into my first project with an actual budget, I'm wondering what the difference is between all these titles. What's the difference if any in what they do?

Line Producer vs. Unit Production Manager vs. Production Coordinator vs. Production Manager



Dumb question of the day I'm sure, but I searched the web and didn't really find much as to how they are different.
 
I'm pretty sure a Line Producer and UPM are the same thing, but a Line Producer is paid salary and isn't union, and a UPM is union and paid per diem. I think.
 
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