GPS approaches in Infinite flight were never correctly shown, until this update. GPS approaches provide you with lateral navigation with verticle benchmarks, most typically RNAV. As I’m typing this looks like @Trio answered already, but I’ll provide a bit more of a visual aid. Most airports have some sort of charts, you can google them or I often use https://skyvector.com/ which has charts for all US Airports, the rest I usually google.
Take the RNAV for KMRY as an example, as you can see on the chart there are plotted waypoints on it which are usually up to date in Infinite Flight. You plug them into your flight plan, then while descending follow thE cross section below that shows the proper altitudes based on the waypoints. If you want to look at what certain symbols mean, take a look at this great resource Trio found as well.