3 ms·Presumably, the first responder could could have an altimeter (or gps) and know their own height.by gizmo686 12y agoPresumably, the first responder could could have an altimeter (or gps) and know their own height.F_J_H 12y agoBetter, but still not going to be overly helpful. Call came from 1000ft, first responder is standing at 750ft - there are 250ft of floors in between.JshWright 12y agoSo now we just need to carry blueprints for every building that tells us how tall the floors are...