Near Intersection of I-35 & I-90 Southern Mn. | Your display can be set to run off of other speed sources If so, they need to be calibrated. Check that you are using GPS as the speed source. No calibration is needed if the InCommand is receiving the VTG message and is set to use GPS speed.
Also the NEMA messages that the InCommand needs for speed might have gotten changed after the update that you performed. This shouldn't have happened but may have inadvertently gotten changed.
If you go to diagnostics in the upper right corner and look at GPS, you should see the NEMA messages scrolling by. Pause the messages from scrolling and look through the messages, you should see the NEMA message VTG and a value. VTG is the message from the GPS that includes the speed indication.
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