Yeah, these guys have it right! There are three separate cases:
- Quick glance. Cancels -1/level in range penalties to Vision rolls only.
- Active spotting attempt using Aim maneuver. Cancels -2/level in range penalties to Vision rolls only.
- Aim weapon using Aim maneuver. Gives +1/level to Acc for ranged attack rolls only.
None of these three is ever in any way cumulative with the other two.