Electronic Flight Information System (EFIS)

The EFIS control panel sits at the very heart of the T-6/A Texan II's navigation system and controls the EHSI and EADI instruments. More on both of those instruments can be found on their appropriate pages.

The EFIS buttons and dials are as follows (left to right, top to bottom);

• Heading adjustment knob - Alters the heading bug on the EHSI and composite mode screens. (left to rotate anti-clockwise, right to alter clockwise and push to reset bug.)
• HSI Switch - Toggles the EHSI between HSI and DG modes.
• ARC Switch - Toggles the EHSI between ARC Map with VOR, ARC Map with VOR & NDB, ARC Map with VOR, NDB and Airports and ARC Map off.
• NAV Switch - Toggles between VOR and GPS primary navigation modes.
• RNG + - Increases MAP and ARC Map visible range.
• Course adjustment knob - Alters the course arrow on the EHSI and composite mode screens. (left to rotate anti-clockwise, right to alter clockwise and push to reset arrow.)
• MAP Switch - Toggles the MAP between MAP with VOR, MAP with VOR & NDB, MAP with VOR, NDB and Airports and MAP off.
• VOR Arrow Switch - Toggles the display of the white VOR direction arrow on the EHSI.
• GPS Arrow Switch - Toggles the display of the purple GPS direction arrow on the EHSI.
• RNG - - Decrease MAP and ARC Map visible range.