Guys sorry newb question here, is the speed shown GS or TAS?

GS is underneath the airspeed indicator

I believe it’s none of the above… IAS probably

IAS is always shown in the airspeed indicator

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Say, Nathan, I thought the GS is shown only in the HUD view with the wind details?

Yeah, that’s where it is

The airspeed indicator always shows Indicated Airspeed
The ground speed is shown with a ‘GS’ reading on the bottom left of the HUD, just underneath the IAS column

The information/status bar on the bottom can be configured to show either or both, but that’s a bit easier since both are labelled in that case

When acting as ATC the aircraft’s speed is GS.

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Now that is a great revelation for me!