Due to aiming errors, no useful data was returned.

Depending on the eye position behind the sight and the closeness of the target this induces some aiming error.

For larger targets at a distance (given the non-magnifying, quick target acquisitions nature of the sight) this aiming error is considered trivial.

But the single runway at the Kennedy center affords the astronauts little leeway for maneuvering in case of last-minute shifts of wind or aiming errors.

This aiming error may cause the arrow to hit the attacker's own melee unit instead, causing the same amount of damage, and friendly fire is a permanent aspect of the game.

Only problem is there's only six of those monsters on our sector, they take for ever to reload, and have an aiming error of over twenty-five yards even with a professional behind them.

This optical effect causes parallax induced aiming errors that can make a telescopic sight user miss a small target at a distance for which the telescopic sight was not parallax adjusted.

On higher difficulties, the optional "auto-aiming", in which the game corrects slight aiming errors automatically, becomes less effective and bonus items such as protective shields are absent in order to increase the challenge.

Arrows may miss their targets due to a small degree of simulated aiming error that becomes significant at long range, or the target may simply move out of the way before the arrow reaches them.

The planned course corrections, Mr. Cutting said in an interview, are one on May 21, to eliminate any slight aiming errors resulting from the initial boost, another about 300 days into the flight and the final one a few weeks before Magellan is due to arrive at Venus in August 1990.

To eliminate parallax induced aiming errors, telescopic sights can be equipped with a parallax compensation mechanism which basically consists of a movable optical element that enables the optical system to project the picture of objects at varying distances and the reticle crosshairs pictures together in exactly the same optical plane.