I would suggest being more flexible about *when* the queries are made. You
seem to have fixated on every 50 meters. Why not every two minutes? Or every
n minutes, depending upon the current network latency? Or even a heuristic
scheduler based on multiple factors? I would also suggest considering
decoupling the activity from the provider. Perhaps by using a separate
service that pushes new queries to the activity. Avoid creating your own
threading framework.

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