Camera pivot - rotate around objects

One of the most useful camera navigation techniques:

Right mouse button hold down > place center reticle on pivot point > while holding right mouse button, hold also "ctrl" button and move mouse to pivot.

• Hold the right mouse button down.
• Move the mouse slightly to reveal the circular 'reticle' in the absolute middle of the view. That's basically your navigation cross hair. This reticle is your pivot point. 
• While still holding the right mouse button, swivel to place the reticle on an object you want to pivot around, or a spot on the terrain. 
• Hold down the ctrl button, while continuing to hold the right mouse button: now move the mouse to rotate around that pivot point. 

Pivot Around The Reticle

Tips

• Practice a number of times, try up and down. Try to swivel quickly to 180 degrees, opposite side of some object. 
• Careful: Picking a spot way far in the distance near the horizon could have you pivoting around a point 100's of meters away.  Maybe that's a good thing sometimes...?