411a
Have no idea why the note is not on the GPS chart.
I looked in the AIM, and it might be better to ask why the ILS and VOR plates
have the 'procedure not authorised without local altimeter setting' notes.
Section
5-4-5 a 4 . Instrument Approach Procedure Charts, starts
Approach minimums are based on the local altimeter setting for that airport, unless annotated otherwise;
So the default is to use the local altimeter.
and the section ends
When the altimeter setting(s) on which the approach is based is not available, the approach is not authorized.
So the GPS plate is not authorised without local altimeter because the AIM says so. I guess the ILS and VOR notes are just helping out the people who have forgotten that part of the AIM.
