Yes, we use watch conditions as well.
I think if the terms used are either the traditionally used or defined somewhere, like in the SMS then no problem. My SMS does not use the term. I’d be very reluctant to just start using it on my own,
Googling “OICNW” and “conn” doesn’t turn up much.
Here’s a similar thread I started here: Responsibility and authority of OICNW
BTW the sea story I tell on that thread took place the during the same port stay the C/M asked me about long underwear I mentioned in the winter gear thread. We were in Adak.