Two ways:
1) If you're moving the view with Alt+mouse, it continues to display Vheight (and the viewer coordinates) as long as you keep Alt+mouse button held down. If you're using the navigation panel, after moving the view it continues to display these values until you move the mouse outside the navigation panel.
2) There's a persistent version of this display in the "3D Preview Location" window which can be opened from the View menu.
Matt