When the watch is close enough to communicate with its paired phone, it may start to use the phone's location information.
Android Phone Users
The watch will use a paired phone's location information whenever it is close enough to communicate with the phone.
The watch's built-in GPS is used if the phone's location information is turned off, if the watch is unable to communicate with the phone, etc.
iPhone Users
The watch's built-in GPS is used by the CASIO app's Activity and Save Daily Location Info.
Location Memory uses the phone's location information.