The Scan techniques
Divides the sky into blocks, each spanning 10 to 15 degrees of the horizon, and 10 degrees above and below it—for a total of 9 to 12 blocks, or scan areas.
Side-to side scanning method: Start at the left of your visual area and make a methodical sweep to the right, pausing in each block of viewing to focus your eyes. At the end of the scan, return to the panel.

Front-to-side scanning method: Start at the center block of your visual field (center of front windshield); move to the left, focusing in each block then swing quickly back to the center block after reaching the last block on the left and repeat the performance to the right.
