This is a new feature to the Pod app as of February 2017. Have a look here for more information on how to set up multiple safe zones.
Please note the Pod is not pin-point accurate and false alerts may be triggered if your Safe Zone is too small. We recommend making your Safe Zone radius at least 30ft (10m) larger than the “safe” area. This will allow a small buffer to minimize false alerts but will not significantly affect your escape alerts.