The TDC is unusable in the Fleetboats, unless you add Nisgeis's
3D TDC and Radar Range Unit, which is a work of art, in addition to being really, really cool... My guess though, is that you are referring to the links to the TDC on the periscope screen, like this:
If such is the case, about the only thing you can do in FotRSU is to try different settings in the Graphic Options of the game, with the Post Processing Filter maybe helping the most, since it does a "blur" effect, as well as a couple other "cinematic" effects on the screen. CapnScurvy made
Optical Targeting Correction for RSRDC and TMO, and he added a range dial to his mod, which greatly improves that functionality. We keep hoping he'll come out of retirement long enough to do an OTC for FotRSU, but don't hold your breath - he is working on a 1955 Mercury, and loves parts "shopping", which probably involves travel across the country.
