Well, if you want to see the accuracy of the game's rendition of the TDC try the following:
Point your periscope/tbt at bearing 45.
Send range 8,000 yards.
Send AOB 45 port.
Send speed 8 knots.
Enter attack map and observe the torpedo run line.
Turn on the PK and watch the torpedo run line.
You can see that it's not skipping degrees or even fractions of a degrees but transitions smoothly.
At a guess, the game just generally uses whatever level of precision the used data type is. I.E. float or double data type, whose precision varies by language and encoding. Attempting to force your data into rounding at some number internally is generally not a hot idea and can lead to all sorts of problems. Generally, data is just rounded and formatted for display purposes only.
Edit: Oh, now as an idea, the developer mentioned above just might have been talking about the automatic tdc difficulty setting. In this case, I could easily see the TDC rounding target data to 1 knot/degree/meter. That doesn't mean that's what the ship is actually doing, but would again be a way of formatting the data into easily digestible chunks for the end user.
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