- (void) navigateToLatitude:(double)latitude
                  longitude:(double)longitude
{
   if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"waze://"]]) {
      //Waze is installed. Launch Waze and start navigation
      NSString *urlStr = [NSString stringWithFormat:@"waze://?ll=%f,%f&navigate=yes",latitude,longitude];
      [[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlStr]];
   } else {
      //Waze is not installed. Launch AppStore to install Waze app
      [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://itunes.apple.com/us/app/id323229106"]];
   }
}