The GI 275 base unit shows configurable pages from the equipment connected to it: moving map, HSI, CDI with map underlay, traffic, weather, terrain, radar altimeter, Stormscope and transponder. What a page shows depends on the navigator, traffic, weather and transponder units that are interfaced.
A backup GPS antenna on the glareshield can serve as a VFR GPS source in Class I and II aircraft that have no external GPS. An internal backup battery is optional for an MFD installation and powers the essential display sensors for at least 60 minutes.