GPS no signs of movement on agopen screen

Just downloaded the lastest version and connected the GPS. It is outputting a single message GPGGA. The Agopen program is seeing the correct coordinates however when I mount the gear in the tractor I do not see any sign of movement on the Agopen screen.
The simulator is off and the gps is connected. I can change and parameter for the gps via U-Center so do I need to include another message to see the gps come to life.
Your help will be appreciated

Solution found
The gps must output a VTG message as well.

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