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    <p>The <code>routeLine</code> and <code>routeLineView</code> variables can only point to one overlay and overlay view at a time so you would theoretically need an array of such variables.</p> <p>However, based on the code shown, you don't need to keep references to these in the first place.</p> <p>I suggest removing the <code>routeLine</code> and <code>routeLineView</code> variables.</p> <p>Then you just create an overlay object locally and in <code>viewForOverlay</code> return a view for the requested <code>overlay</code> parameter.</p> <p>In the <code>loadRoute</code> method, you can loop through the <code>routesArray</code> and for each route, create a local overlay object, and call <code>addOverlay</code> on it.</p> <p>There's also an easier way to construct a map rect that bounds all the routes so you can set the map's region to show them all.</p> <p>Example:</p> <pre><code>-(void) loadRoute { _routeRect = MKMapRectNull; for (int raIndex = 0; raIndex &lt; routesArray.count; raIndex++) { //So we grab an array that holds all the locations of one route. NSArray *locations = [[NSArray alloc] initWithArray: [routesArray objectAtIndex:raIndex]]; //note we are getting object at raIndex (not 0) above //...no change to existing code here... //self.routeLine = [MKPolyline polylineWithPoints:pointArr count:[locations count]]; //replace above line with this... MKPolyline *pl = [MKPolyline polylineWithPoints:pointArr count:[locations count]]; [mapView addOverlay:pl]; //Zoom in to fit route on screen //_routeRect = MKMapRectMake(southWestPoint.x, southWestPoint.y, northEastPoint.x - southWestPoint.x, northEastPoint.y - southWestPoint.y); //replace above line with this to create a rect around ALL routes... if (MKMapRectIsNull(_routeRect)) _routeRect = pl.boundingMapRect; else _routeRect = MKMapRectUnion(_routeRect, pl.boundingMapRect); // clear the memory allocated earlier for the points free(pointArr); } } </code></pre> <p>In <code>viewDidLoad</code>, just call <code>loadRoute</code> and don't call <code>addOverlay</code>.</p> <p><br> The <code>viewForOverlay</code> method becomes much simpler:</p> <pre><code>- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id &lt;MKOverlay&gt;)overlay { MKPolylineView *pv = [[MKPolylineView alloc] initWithPolyline:overlay]; pv.fillColor = [UIColor redColor]; pv.strokeColor = [UIColor redColor]; pv.lineWidth = 3; return pv; } </code></pre> <p><br> By the way, in <code>loadRoute</code>, this line:</p> <pre><code>MKMapPoint* pointArr = malloc(sizeof(CLLocationCoordinate2D) *[locations count]); </code></pre> <p>should be:</p> <pre><code>MKMapPoint* pointArr = malloc(sizeof(MKMapPoint) *[locations count]); </code></pre> <p>It should use the size of <code>MKMapPoint</code> (not <code>CLLocationCoordinate2D</code>).<br> They are not the same thing (even though the structs happen to be the same byte size).</p>
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