You have selected a MacIntosh computer with a PowerPC processor as your X-Plane platform, and the Garmin GNS530
Trainer software as your GPS device. There are two ways you can put this together.
Use the XNO2 plugin.
Written by Ben Russell and given to the X-Plane community in December 2005. Advantages: polished user interface; no need to
install python interface. Detailed instructions
Written by Ed Park and distributed under the Gnu Public License. Advantages: actively maintained; source code
included; works on all X-Plane platforms. Detailed instructions