Texture2d in the middle of a camera screen?

Hi, Heres what I mean, I have two cameras, one is a small viewport that is .7 x and y, and is .3 width and height. How can I display a texture on oboe the small camera viewport? To show a you are here kind of thing on a minimap thanks! And merry Christmas!

GUI.Texture will allow you to draw a texture to screen.

http://unity3d.com/support/documentation/Components/class-GuiTexture.html