Toggle heading hold

`Ctrl` + `H`

All hotkeys for FlightGear

Special action Autothrottle adjust	`Num 9`
Special action Autothrottle adjust	`Num 3`
Special action Heading adjust	`Num 4`
Special action Heading adjust	`Num 6`
Special action Altitude adjust	`Num 8`
Special action Altitude adjust	`Num 2`
Numeric keypad Rudder	`Num 0`
Numeric keypad Rudder	`num⤶ Enter`
Numeric keypad Center aileron/elevator/rudder	`Num 5`
Numeric keypad Elevator trim	`Num 7`
Numeric keypad Elevator trim	`Num 1`
View directions Forward	`↑ Shift` + `Num 8`
View directions Left/forward	`↑ Shift` + `Num 7`
View directions Left	`↑ Shift` + `Num 4`
View directions Left/back	`↑ Shift` + `Num 1`
View directions Back	`↑ Shift` + `Num 2`
View directions Right/back	`↑ Shift` + `Num 3`
View directions Right	`↑ Shift` + `Num 6`
View directions Right/forward	`↑ Shift` + `Num 9`
Display options Toggle instrument panel on/off	`↑ Shift` + `P`
Display options Toggle 3D/2D cockpit (if both are available)	`C`
Display options Cycle panel style full/mini	`↑ Shift` + `S`
Display options Shift the panel in y direction	`↑ Shift` + `F5`
Display options Shift the panel in y direction	`↑ Shift` + `F6`
Display options Shift the panel in x direction	`↑ Shift` + `F7`
Display options Shift the panel in x direction	`↑ Shift` + `F8`
Display options Read a panel from a property list	`↑ Shift` + `F3`
Mouse (normal mode) Show panel / cockpit hotspots	`Ctrl` + `C`
Display options Minimize HUD	`I`
Display options Maximize HUD	`↑ Shift` + `I`
Display options Change color of HUD/toggle HUD off	`H`
Display options Change color of HUD/toggle HUD off	`↑ Shift` + `H`
Display options Zoom in	`X`
Display options Zoom out	`↑ Shift` + `X`
Display options Cycle view modes forth and back	`V/V`
Display options Cycle view modes forth and back	`↑ Shift` + `V`
Display options Reset view modes to pilot view	`Ctrl` + `V`
Display options Increase visibility (fog)	`Z`
Display options Decrease visibility (fog)	`↑ Shift` + `Z`
Display options Toggle menu on/off	`F10`
Autopilot related Toggle altitude lock	`Ctrl` + `A`
Autopilot related Toggle glide slope lock (NAV 1)	`Ctrl` + `G`
Autopilot related Toggle heading hold	`Ctrl` + `H`
Autopilot related Toggle NAV 1 lock	`Ctrl` + `N`
Autopilot related Toggle autothrottle	`Ctrl` + `S`
Autopilot related Toggle terrain follow (AGL) lock	`Ctrl` + `T`
Autopilot related Add 1000 ft. to your altitude (emergency)	`Ctrl` + `U`
Autopilot related Toggle autopilot heading mode	`F6`
Autopilot related Autopilot altitude dialog	`F11`
Engine control Select 1st engine	`!`
Engine control Select 2nd engine	`@`
Engine control Select 3rd engine	`#`
Engine control Select 4th engine	`$`
Engine control Decrease magneto on selected engine	`{`
Engine control Increase magneto on selected engine	`}`
Engine control Select all engines	`~`
Engine control Fire starter on selected engine(s)	`S`
Engine control Lean/Enrich selected engine mixture	`↑ Shift` + `M`
Engine control Lean/Enrich selected engine mixture	`M`
Engine control Decrease/Increase selected propeller RPM	`↑ Shift` + `N`
Engine control Decrease/Increase selected propeller RPM	`N`
Miscellaneous Toggle parking brake	`↑ Shift` + `B`
Miscellaneous Apply all brakes	`B`
Miscellaneous Raise/lower landing gear	`G`
Miscellaneous Raise/lower landing gear	`↑ Shift` + `G`
Miscellaneous Apply left brake (useful for differential braking)	`,`
Miscellaneous Apply right brake (useful for differential braking)	`.`
Miscellaneous Toggle tail-wheel lock	`L`
Miscellaneous Extend flaps	`]`
Miscellaneous Retract flaps	`[`
Miscellaneous Pause simulation	`P`
Miscellaneous Simulation speed up/slow down	`A`
Miscellaneous Simulation speed up/slow down	`↑ Shift` + `A`
Miscellaneous Clock speed up/slow down	`T`
Miscellaneous Clock speed up/slow down	`↑ Shift` + `T`
Miscellaneous Save current flight to fgfs.sav	`↑ Shift` + `F2`
Miscellaneous Restore flight from fgfs.sav	`↑ Shift` + `F1`
Miscellaneous Save screen shot	`F3`
Miscellaneous Exit program	`Esc`
Mouse (normal mode) (click on the right side of a knob) Increase setting (when clicked on a knob)	`Mouse left click`
Mouse (normal mode) Make larger changes	`Mouse middle click`
Mouse (normal mode) Mouse wheel can be used on some controls	`Mouse wheel up and down`