Wiktionary
vb. (context idiomatic English) To obtain something necessary, especially a dose of an addictive drug or anything else compulsively sought after.
Usage examples of "get a fix".
Now, with the coordinate models reconciled, he was monitoring in order to get a fix on the ship's course in hyperspace, as related to the Confederation's galactic chart.
Ever since we brought it in we've been trying to get a fix on another that may be female, but we've had no luck yet.
I'm making like a bat out of hell for Sierra Bay, and I think I'll get a fix on the high hill there.
He steadied the ship with attitude jets, then began a general inventory, trying to get a fix on where he was and on the extent of the damage.
The aliens probably don't have time to get a fix on the transporter signal.
Derec turned his head from side to side, trying to get a fix, but the impression was fuzzy, as if coming from a wide area.
Ever since we brought it in, we've been trying to get a fix on another of the same species that might be female.
Now, with any luck, I can get a fix on these signals before they fade out.