[ALREADY REPORTED] TACAN direction marker keep magnetic heading when change to TRUE

[Ares63]

 

IF i change from magnetic heading to true heading on HUD and on HSI also the direction marker follow the magnetic heading ant it doesn't point on TACAN station

[Tholozor]

Someone correct me if I'm wrong, but isn't that because the TACAN station only provides magnetic heading to aircraft tuned into the channel?

[Ramsay]

Someone correct me if I'm wrong, but isn't that because the TACAN station only provides magnetic heading to aircraft tuned into the channel?

The behaviour is true for a mechanical HSI (i.e. as found in the F-5E) if not correctly aligned with magnetic north.

 

However, AFAIK for a more sophisticated system as found in the Hornet, switching the HSI to display 'true' bearings, changes the display format, rather than the underlying data (that may be a mix of GPS coordinates, moving map tiles, TACAN station, etc.).

 

So the TACAN station position on the DDI moving map shouldn't change when the display format (Heading tape, HSI, etc.) is changed from magnetic to true.