I am puzzled by the unit of measure in the AIM stream seen by my Smart3 Corsa.
I updated all RS3 units of measure (see attached)
The MXS output is actually the GPS speed
The AIM stream seen by the Smarty 3 Corsa still shows channel 2 vehicle speed as KPH (see circled in attached)

It sort of doesn't matter because my graphics use GPS speed anyway, but I don't know why this unit of measure is still KPH. I can't edit this.

FWIW: I often first take my data from the Corsa video card, because I can do that quickly and pull data from the dash later in the day. AIM matches the dash and video data up nicely. Data on Video card is a very cool feature.

Race Studio 3


SmartyCam Corsa Config


AIM MXS 1.3 Config

 

Check the actual overlay config.

 

As I said, the overlay config (I assume you mean graphics overlay) I set to the GPS speed and that’s MPH.

So this is more of a minor curiosity than a real problem. it’s just the AIM stream sent to the camera

 

Sorry - I was at a concert looking at my phone last night. The AiM stream is always in metric units in the background. That isn't the problem and doesn't actually matter.

Post a photo of your overlay. That is where the issue is most likely happening.