This will take you step by step and show how you can use either a fixed center point, or a parameter to dynamically change the center point location to filter/calculate the points within "x" miles of your chosen location using the newer Tableau geospatial formulas.

This tutorial will walk you through creating a button to swap back and forth between showing the full years worth of data, and showing all years filtered to the most recent date in your dataset. This can be useful when trying to see how the current year compares with prior years when not yet occurring dates aren't included.