what is the meaning of the 2 satellite types in a circle? the others i think are gps and glonnas , but cant guess the first 2
ty in advance 
and what is the velocity chart measuring exactly ?
Those are SBAS you are seeing.
Velocity is the gps speed in each direction with some clever calculations
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More info on the chart in the docs:
https://docs.emlid.com/reach/common/reachview/status/
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ty 
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