OK, I returned my Sargo sub to base, loaded RFB 2.0 (Previously running 1.52 with some tweaks) and have checked the radar mod. It seems to work correctly except for the bearing indicator
The true course dial (A repeater of the main ship's Gyrocompass) is stuck, and only the relative bearings dial is rotating. I think that in the instructions from my mod a fix was indicated, but I will check the RFB files directly ASAP.
Other than that, I also miss being able to knock down the masts in the Sampans
but not the contact icons, as I play without map updates.
The new interior textures and rounded indcators are great, looking forward to see more subs implemented, as I usually play with P, Sargos and S-Class, only rarely with Tambor/Gato/Balao/Tench