In German they have “Wahrschau” which coincidentally also sounds like the name of the capital in Poland, however it comes from shipping industry and to my knowledge is a shorter version of “Wahr nehmen und schauen” which roughly translates to “hey, look at me”. I might be wrong, but that’s what I’ve heard.
Edit: typo 😅 Edit 2: some more of my incompetence
Sorry about the typo. My German is a rusty 😅 As to whether it’s a shipping or a northern thing, could be both. I used to study maritime navigation in northern Germany and this was a very common saying in between the maritime crowd. Did hear it out side of it though. But I might be mistaken.