Hi pdiddy, the Fire Control Crew probably had a math wizz working at the chart table, checking/double checking the findings from the Stadimeter (or maybe not....depends on the crew's abilities and who was good with a slide rule). But, for the most part the Periscope's Stadimeter Dial provided the bulk of the information.
The Stadimeter Housing Unit was fastened onto the bottom of the Periscope. The outside view was brought down through a set of prisims, passing through the Stadimeter len's before going to the eye piece. It had two half len's that slide next to each other, giving the double image. Depending on which axis the sliding edge was pointed to, Up/Down, Left/Right.....the Stadimeter would produce either an estimate of range, or an estimate of target course angle (AoB), shown on the Stadimeter Dial. Both could be found well less than a minute by most Captains.
The Stadimeter had two dials, both identical, on either side of the Periscope. It was faster to have a second observer stationed at the opposite dial to make the reading of range or target course, rather than the Captain who kept his focus at the eye piece.
Although there was no direct link to the TDC, the observer usually called out the found range and target course to have the TDC operator input the information. Unlike the TBT (Target Bearing Transmitter), which
did have direct input to the TDC for
just target bearing. No such direct link was made from the Periscope.
In both devices, the game has taken some creative license in simulating their functions and capabilities. In the Stadimeter's case, the game left out an important function for determining AoB from the real life unit. The game only allows it to work vertically, not horizontally too.
The Omnimeter was a real life tool that helped determine target Range when using the Telemeter hashmarks within the Periscopes lens. It was set with the specific height or length, for whatever reference point you could best use (mast top, funnel, bridge roof, deck etc.) and the calculation was done by counting the Telemeter divisions.
On the other hand, the Stadimeter automatically moved the center Dial Ring (one of three Dial Rings of the Stadimeter Dial), when you possitioned the double image on the corect reference point. The third outer ring of the Dial was manually set to the Targets Length. The inner dial ring was stationary, representing the Targets Height.