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    <p>I have done something similiar to this to zoom out (or in) to an area that included a point annotation and the current location. You could expand this by looping through your annotations.</p> <p>The basic steps are:</p> <ul> <li>Calculate the min lat/long <br/></li> <li>Calculate the max lat/long <br/> </li> <li>Create CLLocation objects for these two points<br/></li> <li>Calculate distance between points<br/></li> <li>Create region using center point between points and distance converted to degrees <br/></li> <li>Pass region into MapView to adjust<br/> </li> <li>Use adjusted region to set MapView region<br/></li> </ul> <pre><code> -(IBAction)zoomOut:(id)sender { CLLocationCoordinate2D southWest = _newLocation.coordinate; CLLocationCoordinate2D northEast = southWest; southWest.latitude = MIN(southWest.latitude, _annotation.coordinate.latitude); southWest.longitude = MIN(southWest.longitude, _annotation.coordinate.longitude); northEast.latitude = MAX(northEast.latitude, _annotation.coordinate.latitude); northEast.longitude = MAX(northEast.longitude, _annotation.coordinate.longitude); CLLocation *locSouthWest = [[CLLocation alloc] initWithLatitude:southWest.latitude longitude:southWest.longitude]; CLLocation *locNorthEast = [[CLLocation alloc] initWithLatitude:northEast.latitude longitude:northEast.longitude]; // This is a diag distance (if you wanted tighter you could do NE-NW or NE-SE) CLLocationDistance meters = [locSouthWest getDistanceFrom:locNorthEast]; MKCoordinateRegion region; region.center.latitude = (southWest.latitude + northEast.latitude) / 2.0; region.center.longitude = (southWest.longitude + northEast.longitude) / 2.0; region.span.latitudeDelta = meters / 111319.5; region.span.longitudeDelta = 0.0; _savedRegion = [_mapView regionThatFits:region]; [_mapView setRegion:_savedRegion animated:YES]; [locSouthWest release]; [locNorthEast release]; } </code></pre>
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    1. POPositioning MKMapView to show multiple annotations at once
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    1. COThis looks like the way to go. Thanks!
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    2. COManaged to get this to work using `MKCoordinateRegionMake`: https://gist.github.com/1599700 in case anyone still wanna do it this way.
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    3. COregion.center.latitude = (southWest.latitude + northEast.latitude) / 2.0; Thanks for it
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