Heatmaps can be used to visualize the density of the coordinate pairs you've plotted to a map. You can replace the markers on your map with a heatmap overlay any time you'd like by changing the "Render Style".
New maps automatically default to using markers. To switch to a heatmap, open the "Style" menu in the top left corner of your spreadsheet.
There, you'll find a dropdown menu called "Render Style", which will be set to "Markers". Click on it and select the "Heatmap" option.
The map will adjust immediately. A heatmap will render in place of your markers.
We also hide the marker styling options, since they will no longer be applicable. Keep in mind, any styling changes you made to your markers will be saved for use later. You won't lose any customization.
The heatmap adjusts as you Zoom-In, allowing you to identify individual coordinates.
You can switch back to marker mode at any time by changing your "Render Style" back to "Markers".