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    <p>Mason's answer really helped me. You'll need some modifications such as setting the absolute value of longitude &amp; latitude. Here's a code snippet of using CoreLocation + Image I/O to write an UIImage to disk with GPS information:</p> <pre><code>- (BOOL)writeCGImage:(CGImageRef)theImage toURL:(NSURL*)url withType:(CFStringRef)imageType andOptions:(CFDictionaryRef)options { CGImageDestinationRef myImageDest = CGImageDestinationCreateWithURL((CFURLRef)url, imageType, 1, nil); CGImageDestinationAddImage(myImageDest, theImage, options); BOOL success = CGImageDestinationFinalize(myImageDest); // Memory Mangement CFRelease(myImageDest); if (options) CFRelease(options); return success; } - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { if (newLocation) { [manager stopUpdatingLocation]; // Create formatted date NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"UTC"]; NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setTimeZone:timeZone]; [formatter setDateFormat:@"HH:mm:ss.SS"]; // Create GPS Dictionary NSDictionary *gpsDict = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithFloat:fabs(newLocation.coordinate.latitude)], kCGImagePropertyGPSLatitude , ((newLocation.coordinate.latitude &gt;= 0) ? @"N" : @"S"), kCGImagePropertyGPSLatitudeRef , [NSNumber numberWithFloat:fabs(newLocation.coordinate.longitude)], kCGImagePropertyGPSLongitude , ((newLocation.coordinate.longitude &gt;= 0) ? @"E" : @"W"), kCGImagePropertyGPSLongitudeRef , [formatter stringFromDate:[newLocation timestamp]], kCGImagePropertyGPSTimeStamp , nil]; // Memory Management [formatter release]; // Set GPS Dictionary to be part of media Metadata // NOTE: mediaInfo in this sample is dictionary object returned in UIImagePickerController delegate: // imagePickerController:didFinishPickingMediaWithInfo if (mediaInfo &amp;&amp; [mediaInfo objectForKey:UIImagePickerControllerMediaMetadata] &amp;&amp; gpsDict) { [[mediaInfo objectForKey:UIImagePickerControllerMediaMetadata] setValue:gpsDict forKey:@"{GPS}"]; } // Save Image if([self writeCGImage:[image CGImage] toURL:imageSaveURL withType:kUTTypeJPEG andOptions:(CFDictionaryRef)[mediaInfo objectForKey:UIImagePickerControllerMediaMetadata]]) { // Image is written to device } } } </code></pre>
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