In June 2018 google changed the billing model for their map and distancematrix API service. depending on your region you may have been impacted at different times. you will see that if you get persistent google quota exceeded messages or a grey background map display with a “for development only” message.
IPhoneLocator v2.48 (soon published on app store) introduces a new variable GoogleMapKey which must be initialized with your own google map api key value that you can get from the google map page https://cloud.google.com/maps-platform/. This key is needed to allow the API calls to DistanceMatrix and Geocode API as part of each “refresh” loop call and to display the map in the settings tab.
Depending on your usage patterns and number of iCloud devices you may have more or less consumptions of the google api and this could have a cost if the total exceed 200$ ( the first 200$ are not charged by google )
so Please before using this, read the Google map key section in the document http://code.mios.com/svn/mios_iphone-detector/trunk/iPhoneLocator/Another%20UI7%20Install%20doc.pdf or https://github.com/amg0/IPhoneLocator to understand and estimate the cost consequences and have an example of an average use ( mine )
please be mindful about these informations and eventually set a maximum quota in google cloud console if you have doubts as IPhoneLocator cannot be hold responsable for unforeseen costs.