Family Monitor allows for alerts to be set that are triggered when a family member becomes closer to, or further from, a location or another family member. For example, an alert can be created that is triggered if your child moves further than 100 metres from you. Family Monitor only needs to be installed on the device of the person doing the monitoring. For example, Family Monitor would be installed on the parent's device but not on their children's. However, those being monitored must proactively accept their location being monitored by allowing location sharing and, additionally, they will be regularly reminded that their location is being shared. This ensures that monitoring cannot be undertaken in an underhand way.
This is the full version of the app - an unlimited number of alerts can be defined.