Do you mean the glide range ring, or the "Boeing banana" ... time expected to reach selected altitude little blue arc? From your other post I know you have G5's so you should be able to get this display. For the glide range ring, it's possible they didn't configure the glide ratio and best glide speed in the configuration. For the banana, I don't recall there being any sort of configuration setting for that. As long as you have some sort of display capable of feeding airdata and selected altitude to the unit (you have dual G5's), and everything is set up, I believe that should "just work". From your prior posts on the lack of GS, I see you have ARINC 429 IN 1 set to EFIS FORMAT 2, which should be correct (assuming the gad29's corresponding output is set to EFIS/AIRDATA 1 SDI 1), and should provide all the info needed to enable this feature. Are you setting the desired altitude on the G5? If you go the Winds/Density Altitude calculator in utilities on the GTN are you seeing pressure altitude/baro altitude and such filled in from the sensor data?