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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I would imagine you could do this with react-native-maps. You can even overlay a component on top, which would probably be how you put a semi-transparent circle over it
I suggest using Mapbox: https://github.com/react-native-mapbox-gl/maps
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