Visual heading
Listening to ATC (in Australia) I sometimes hear clearances for visual altitudes - eg descend 3000 visual - as I understand it this means that they are being descended below the minimum altitude for IFR but as the aircraft is visual they are cleared lower as the pilot can look out the window and avoid bumping into the terrain.
But I don't understand what a visual heading is (eg turn right heading 210 visual), can someone please explain.