In the U.S., at least in the Terminal environment, our Radar maps and the Compass rose surrounding the scope are oriented to Magnetic. As others have said, I can tell your magnetic Track pretty closely, your actual heading may depend on a number of things.
As for a no-gyro surveilance (radar) approach, we use the terms "standard rate turn" for 3 deg/sec. After you're pretty well established on the inbound track, we'll ask that you make "half standard rate" turns.
Also in the U.S., published radar approaches are fast becoming scarce. I've done hundreds, but not one in the last three years. In not too many years, there's a good chance you might get a controller who's never done a real one.....
