Best Practices for Logging Tagline Distances on a 3D Quilt

Mine rescue taglines have been spliced at 5-foot intervals since the 1920s because that interval is short enough for a miner in zero visibility to count knots under gloved hands. The problem is not the tagline — it is that distance markers never make it onto the command post map at the same scale the rescuer feels them. Logging tagline positions directly onto a live 3D quilt closes the gap between what a captain knows underground and what incident command sees on the surface.

A rescue team in heavy smoke reads its escapeway by hand. Every 5 feet, gloved fingers find a splice; every 25 feet, a standardized tactile cue — a cone, a coil of tape, a ball — tells the rescuer what the intersection type is. MSHA's Unified Mine Rescue Training IG-115 codifies these tagline procedures, exploration logging sheets, and signal codes as the backbone of post-incident documentation. Yet the command post sees none of this tactile world in real time. It sees a radio report every few minutes: "tagline out 200 feet, turning south."