public void configureProximityNotification() {
        proximityNotification = new MutableLiveData<>(Settings.isGeneralProximityNotificationActive() ? new ProximityNotification(true, false) : null);
    }
LiveData wrapping the PositionHistory object or null if PositionHistory should be hidden
main/src/main/java/cgeo/geocaching/unifiedmap/UnifiedMapViewModel.java