The 2025 IEC publication exists, but SighThor has not recorded the licensed normative thresholds and independent CCTV specialist approval needed to use them defensibly. Numeric selection and distance calculations therefore remain disabled.
A deliberate evidence boundary
SighThor keeps unavailable methodology visible instead of turning an unverified secondary-source table into apparently authoritative output.
Numeric thresholds, zone distances, and compliance language are unavailable pending a licensed normative source and independent specialist review. Existing saved selections are shown as unavailable, not recalculated with a substitute.
Read the official publication recordThis legacy nominal model remains available as a transparent planning aid. The publication was revised in 2025. Its output does not prove identification, installed performance, evidential suitability, or compliance.
Read the official 2014 publication recordWhat a defensible report still needs
Use modelled geometry to prepare the discussion, then preserve the checks that make the final decision defensible.
Start with terrain-aware geometry, then review every source, limitation and field check.