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    <p>This seems to be a limitation of the MKMapView.</p> <p>A workaround is to split the +/-180 crossing into "east" and "west" parts.</p> <p>For an around-the-world trip (finish == start), you can put the "west" part of the crossing at the front of the polyline.<br> For example:</p> <pre><code>CLLocationCoordinate2D newYorkCoord = CLLocationCoordinate2DMake(40.7141667, -74.0063889); CLLocationCoordinate2D londonCoord = CLLocationCoordinate2DMake(51.5, -0.116667); CLLocationCoordinate2D japanCoord = CLLocationCoordinate2DMake(36, 138); CLLocationCoordinate2D sanFranciscoCoord = CLLocationCoordinate2DMake(37.775, -122.4183333); CLLocationCoordinate2D japanToSFMidpointEast; //use average calc as crude way to find midpoint... japanToSFMidpointEast.latitude = (japanCoord.latitude + sanFranciscoCoord.latitude)/2.0; japanToSFMidpointEast.longitude = 180; CLLocationCoordinate2D japanToSFMidpointWest; japanToSFMidpointWest.latitude = japanToSFMidpointEast.latitude; japanToSFMidpointWest.longitude = -180; int pointsCount = 6; CLLocationCoordinate2D *points = malloc(pointsCount * sizeof(CLLocationCoordinate2D)); points[0] = japanToSFMidpointWest; points[1] = sanFranciscoCoord; points[2] = newYorkCoord; points[3] = londonCoord; points[4] = japanCoord; points[5] = japanToSFMidpointEast; MKPolyline *polyline = [MKPolyline polylineWithCoordinates:points count:pointsCount]; [mapView addOverlay:polyline]; free(points); points = NULL; </code></pre> <p><br> If a trip is not around-the-world (finish != start), you'll have to use two polylines.<br> This example goes from Japan to SF:</p> <pre><code>CLLocationCoordinate2D japanCoord = CLLocationCoordinate2DMake(36, 138); CLLocationCoordinate2D sanFranciscoCoord = CLLocationCoordinate2DMake(37.775, -122.4183333); CLLocationCoordinate2D japanToSFMidpointEast; japanToSFMidpointEast.latitude = (japanCoord.latitude + sanFranciscoCoord.latitude)/2.0; japanToSFMidpointEast.longitude = 180; CLLocationCoordinate2D japanToSFMidpointWest; japanToSFMidpointWest.latitude = japanToSFMidpointEast.latitude; japanToSFMidpointWest.longitude = -180; int eastPointsCount = 2; CLLocationCoordinate2D *eastPoints = malloc(eastPointsCount * sizeof(CLLocationCoordinate2D)); eastPoints[0] = japanCoord; eastPoints[1] = japanToSFMidpointEast; MKPolyline *eastPolyline = [MKPolyline polylineWithCoordinates:eastPoints count:eastPointsCount]; [mapView addOverlay:eastPolyline]; free(eastPoints); eastPoints = NULL; int westPointsCount = 2; CLLocationCoordinate2D *westPoints = malloc(westPointsCount * sizeof(CLLocationCoordinate2D)); westPoints[0] = japanToSFMidpointWest; westPoints[1] = sanFranciscoCoord; MKPolyline *westPolyline = [MKPolyline polylineWithCoordinates:westPoints count:westPointsCount]; [mapView addOverlay:westPolyline]; free(westPoints); westPoints = NULL; </code></pre>
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    1. POUnable to draw MKPolylineView crossing longitude +/-180
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    1. COThanks. I was thinking of a similar workaround, but hoping there might have been some feature of MapKit that I missed.
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      1. USJack Bransfield
 

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