I have a still-new-to-me 1988 M20J 205SE with a legacy panel including King HSI, KAP-150, and Garmin 530W. No add-ons for GPSS. Approaching a flight plan dog leg en route the 530W gives a countdown signaling to adjust the HSI OBS knob to the new bearing. The plane responds accordingly but soon afterwards the plane is several degrees off the magenta line, and the HSI CDI according shows going off track. After experimenting with crosswinds from the left and then from the right, I’ve concluded that my setting of the OBS bearing is acting much like a heading bug. In other words if I want to get onto and stay on the magenta line, I have to play with the HSI OBS to zero in on a setting that will keep me on the magenta line and thus CDI showing centered. If the wind changes, a new OBS setting is needed to stay on the magenta line. And yes, this is with the 530W CDI mode set to GPS. I’ve looked at the 530W’s boot up settings pages, but I’m not sure if the settings are right. I haven’t changed any of it. For classic VOR and ILS navigation the plane tracks good. Shouldn’t my equipment be able to track the magenta line en route? If so, anyone got advice on which 530W boot up settings to check? Required configuration settings for 530W inputs and outputs?