1 In the heavy fog he had to fly blind.

2 The pilot had to fly blind in this weather.

3 Researchers typically fly blind when trying to add or modify plant genes.

4 Design engineers say that, too frequently, the nature of their profession is to fly blind.

5 Airplanes are likewise affected by the GPS system faltering as they often must fly blind at night and make assumptions on their location based on lights on the ground.