All ILSs have a glide slope check altitude point which may be the outer marker. However these are now increasingly rare and have been replaced by either a locator or a DME range (usually 4 miles). When I was active the approach ban took effect at 1000ft agl. Is it now normal to use the locator or the 4 mile point? This would be practical as, in theory, a call and altitude check should take place at the GS check alt, an incapacitation call should take place around here, and an altimeter cross check is also needed. If this all took place at the same time, it would surely reduce workload.