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Geofencing is not working properly

In my application I want to do geo-service. I have a list of locations for which I set geoprocessing regions. The entire location has a radius of 100 m . Below is the code for installing Region:

CLLocationCoordinate2D cord;
cord.latitude = [location.latitude doubleValue];
cord.longitude = [location.longtitude doubleValue];
CLLocationDistance regionRadius = location.radius;
CLRegion *region  = [[CLRegion alloc] initCircularRegionWithCenter:cord radius:regionRadius identifier:[NSString stringWithFormat:@"%d",location.locId]];
[appDelegate.locationManager startMonitoringForRegion:region];

My problem is that it is not working properly. For debugging, the didEnterRegion delegate added a remote calculation between the current location and the location of the region several times, this distance is more than 1500 m .

Below is the code for calculating the distance between the current location and the location of the region:

- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {
    CLLocation *loc1 = locationManager.location;
    CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:region.center.latitude longitude:region.center.longitude];
    double dist = [loc1 distanceFromLocation:loc2];
}

Any idea why it is -locationManager:didEnterRegion:working so wrong?

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iOS, Geofencing, .

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Source: https://habr.com/ru/post/1541215/

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