Backsight song?

Don't forget to point the prism toward the gun and shoot your check shot.?ÿ As a greenhorn, the I-man let me walk back to the gun (usually through at least one gully) before he sent me back to turn the prism to him. This only had to happen twice before the bulb light up over my head... The backsite check shot prevents you from occupying the backsite number in the DC and backsighting the occupation point. Horizontal distances check but vertical distances are out to lunch unless both points are at the same elevation.?ÿ

Don't forget to zero set.?ÿ : )