Purpose

By the end of this lesson, you will be able to explain how Semi-Automated Offside Technology works and its role in the broader VAR system.

Lesson Explanation

Building on the precise position and timing requirements from Part 4, Lesson 1, Semi-Automated Offside Technology (SAOT) is a technology-assisted system, introduced at the elite level and now used more widely for the 2025/26 season after a partial rollout the previous year, designed to speed up and increase the precision of offside determinations that were previously made entirely by the human eye and a drawn line on a broadcast replay.

SAOT uses multiple tracking cameras around the stadium combined with a sensor in the match ball to calculate the precise skeletal positions of all players and the exact moment the ball is played by a teammate — the same fundamental legal question from Part 4, Lesson 1, but calculated with dramatically greater precision and speed than a human assistant referee’s eye-line alone, or the older manual line-drawing process on a video replay.

A genuinely important point about the division of labor: SAOT does not replace the human judgment call from Part 4, Lesson 2 about whether a player in an offside position was actively involved in play (interfering, gaining advantage) — it only assists with the more purely mechanical, factual question of a player’s exact position and the exact moment the ball was played. The subjective “was this player interfering with an opponent’s ability to play” judgment remains a human decision by the referee and VAR, protected under the same “Referee’s Call” logic from Part 1, Lesson 3, applied here to the VAR’s own judgment calls rather than only the on-field referee’s.

A genuinely practical benefit already measurable in league use: SAOT has reduced the average time needed to confirm an offside decision by roughly 27 seconds per offside event compared to the older manual review process, a meaningful improvement to game flow and spectator experience that directly serves one of IFAB’s stated aims for the VAR system as a whole, covered further in Part 5, Lesson 5.

Practice Questions