Well, maybe the use of the term “conn” is more widespread than I realized. As I said I don’t recall seeing or hearing it used on the merchant side. In the log I’ve seen “watch relived by …” or “master pilot exchange completed”.
I’ve always felt the the term was conspicuous by it’s absence on the merchant side.
In the Navy the term “conn” is defined (always with the double n) by Navy regulation. Is it in the cfr or law somewhere on the merchant side?