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So then you have a live image of a big black board?

The beauty of the misalignment patrol drone is that it does not leave you guessing wich one exactly of your large number of inexpensive mirrors is out of line. The culprit clearly lights up in the video feed.

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You normally keep all mirrors pointed at the real target. Then take one at a time and point it at the black board off to the side.

You can then use the camera image of the position of the sun spot on the black board to figure out your new calibration settings for this particular mirror.

Ah, separate target for testing assumptions in isolation.

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