at launching and recovery location = gen.

[teammember2]

Accurate position of barge at launching and recovery location = what is the best way to say this in Russian?

[muzungu]

I thing that the barge in your text is rather катер or баркас, than баржа.
Тогда: Точное местонахождение катера при спуске на воду и подъеме (на борт).
Disclaimer: Without a broader context, it's a scientific wild ass guess (hopefully, they don't launch torpedoes :).

[teammember2]

then why do they use "location" in the end of the sentence?

[muzungu]

Doesn't make a difference whether they say "location" or "locationS"