Reality is that Woodbridge area falls under Ysterplaat AFB.
The common practise for all helicopters is to call the tower who will tell you to fly at a given altitude. This is more often than not 1000 ft or below and if they have incoming traffic 500 ft or below.
Must helicopter operators tell the tower "no sorry we will anoy the residents"?
The Oryx flying circuits every day at low altitude also gets seen by residents as the Huey because its also green!!