View source for Issue of losing orientation (Desert fog effect)

This issue can be summarized as '''not knowing where you are''' on the canvas while using a zooming user interface. You see a '''blank screen with not enough clues''' to know here you are. 
=Problem=
[[File:PreziNothingOnScreen0.png|640px]]
Here the content is out of sight. It can be bigger or smaller than the screen, nothing is visible.

[[File:PreziNothingOnScreen2.png|640px]]
Here the whole content is in that 3x5 pixel blot what you see on the top left.

[[File:PreziNothingOnScreen3.png|640px]]

=Solutions=
==Home Button==

[[File:PreziNothingOnScreen.png|640px]]

As you move your cursor on the screen those navigational buttons on the left appear.
Home takes you back to the overview of your content (if you have any).

==Minimap==
One way of showing your location is an '''overview map''', what shows your location from above.
This is typical in computer games.

[[File:SupremeCommanderMiniMap01.png|640px]]

==Visual Clues==
Autodesk 3DS Max shows a grid and a clear origo, even if your workspace is empty.

[[File:3dsMaxEmpty01.png|640px]]

==Other solutions==
There can be many other solutions to show spatial location and zooming degree. 
For example breadcrumbs, colors or blurring can help in orienting the user.