With the 16.4 iOS update, Apple added a new privacy feature that notifies users when an app is using location services. Whether it's the LifeSaver app or any other app, you will see a blue oval around the time (top-left corner) on your home screen.
You may see the blue light pop up even when you are not driving or using the LifeSaver app. This is because your app periodically checks in with the portal to verify that the app is active. Other apps that use location services will also display the blue oval..
If you tap on the blue light, you may see that the app using the location services pops up.