Sited on the final approach track at a distance that permits selection of final approach configuration, and descent from intermediate approach altitude to the appropriate MDA.

In space on the final approach track where the intermediate approach altitude/height intercepts the nominal glide path.

In an instrument approach procedure at which the prescribed missed approach procedure must be initiated in order to ensure minimum obstacle clearance.

That marks the end of an initial segment and the beginning of the intermediate segment of the precision approach.