Being able to locate your children when you need to is a must, 42!. Some devices do require the installation of the family locator application; however phones aren’t compatible with the application can still be located. Also, each time you locate a phone a text message will be sent to the device. Regarding the ability to block the locator from working if the location services on the phone are disabled you wouldn’t be able to locate them, but you can set up family locator to alert you when you location services become disabled.
Learn more about Family Locator here: https://www.verizonwireless.com/support/family-locator-faqs/
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