A portable beacon walked to each corner before the match. A strong static fix is necessary and sufficient for that corner. The tag comes off the grass before kick-off.
Survey the white-line rectangle. Never left on the field.
1 per pitch
Procedure
Lifetime
Setup only — removed before kick-off
Required marks
4 corners · strong fix each (ranger ≠ owner at 3 m)
Optional marks
Centre spot · penalty spots · mid-touch
Acceptance
Solve
4 pins + rectangle prior + inter-anchor mesh
Fail-closed
Any corner not strong → automatic out-of-bounds disabled
There is no override that forces geometry on with an incomplete survey.
No permanent tags on the grass — survey, don't litter.
Figures are engineering targets for the current revision unless labelled otherwise. Patents pending.
Precision. Performance. Power.