Download the PushOver app to your devices. Links available from the Pushover Homepage
Create a zone on PureTrack. These can be edited on the map page under your username -> Edit Zones. Then click "Add Zone", give it a name, enter a radius, click on the map to position your zone, then click "Add Zone".
Select an item on the map. Click the item menu button bottom left to and choose "Add Alert".
Edit the alerts you want to see. Alerts will be delivered to your PushOver App on your devices.