If you haven’t set up ATAK yet, complete ATAK setup instructions first.
On your Android device, open the plugin download directory here
Open ATAK
If prompted, tap “OK” to load the Realm plugin
Go to the Plugins view under the right-side menu
Tap the refresh icon
In the Realm row, tap the checkbox to the left of “Not Loaded”
Tap “Load” to confirm
Open the Realm plugin under the right-side menu
Tap the “gear” icon to go to the Realm settings
You should now see a heatmap overlay at your site.