K-Transfer or HE spotter round. IIRC. PNL. It’s coming back, slowly.
Ah yes, the old days of “charts and darts.” Now it is all done with hand held computers with the firing data electronically direct to individual gun.
I remember once when as FO, the FDC screwed up the ABCA registration and I took over doing it from the op to get a good registration. What a trip that was. That was back when FO sergeants were senior 13Es before 13F fist happened in May or June, 1978.