Why is take off from Hong Kong in a rectangular shape before flying in its intended direction ?

<h3>Why is take off from Hong Kong in a rectangular shape before flying in its intended direction ?</h3>

I flew from Hong Kong to Dubai 3 times and I noticed this each time on take off through the moving map display. It seemed to be for about 10 minutes before we saw the plane fly westwards.

But this seems to be quite standard for alot of departures, is it a particular reason ?


<strong>Hong Kong best answer:</strong>
<p><i>Answer by Victor C.</i><br/>to gain momentum and use the least amount of field area to do so. If they flew straight, they would gain momentum but they would require alot of space in order to do the same job as the rectangle method.</p>
<p><strong>Hong Kong Skyline</strong>
<img alt="Hong Kong" src="http://farm6.staticflickr.com/5219/5400575985_ba0442c134.jpg" width="400"/><br/>
<i>Image by <a href="http://www.flickr.com/photos/21829537@N00/5400575985">sanfamedia.com</a></i>
Hong Kong Skyline from the Peak and Lugard Road</p>

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