No, a KPI without course knob (Digital 400 Hz Resolver version) is not compatible with modern NAV systems.
If you are currently using a KPI version without a course knob, in combination with a controller, you must upgrade your KPI. A KPI with a course knob is required to utilize a newer NAV system, such as the GNS or GTN series displays.
You can find which KPI models have course knobs listed in the part number charts on SEA's KPI product pages.