ATC Speed Commands

Hello, I tried searching for this question but wasn’t able to find a clear cut answer.

On the expert server, when an ATC controller issues a speed command such as “Reduce speed to XXXkts,” is that command being given in IAS or GS? I’m pretty sure the answer is IAS, but I just want to be sure I’m doing the right thing.

Thanks in advance for the help!

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It will always be IAS.


Here’s a great thread which outlines the different types of speed.

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