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Where does the FCC regulation say you need to map it to a specific floor? The carrier just has to say where the person is, not how to get to them. They don't have to provide navigation directions to the EMS crew do they? Seems to me like just giving an elevation and coordinates would be compliant.

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They need to be accurate within 3 meters vertically, and telling a first responder that a call came in from an area say 1000ft above sea level would not be that helpful to him/her when standing in front of a 45 storey building, wondering which floor they should go to.

So, it would seem knowing the floor number would be super helpful (though maybe not a regulatory requirement as you say.)

Presumably, the first responder could could have an altimeter (or gps) and know their own height.

Better, 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.

So now we just need to carry blueprints for every building that tells us how tall the floors are...

A range of 3-4 stories is better than a range of 45...

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