I have a question about 'GS' in my RNAV(GPS) Approach Chart.
Usually, (Including PAPI, VASI whatever...) Normal Glide Descent Angle means 3.00 degree.
but some 'GS' says 3.07, 3.04, 3.09 even 7.75 in KSBS airport. (Picture above)
In this case, What does mean 'GS' exact ?
As far as I know, it's 'GS' means draw an imaginary line extend from Touch-Down Foot marker (1,000ft marker) to FAF for Non-Precision Approach. (Even do I Step-Down Approach ? I also wonder.)
but someone says, it's a line extend from 1,000ft marker to VDP,
and another one says, it's a Normal Descent Rate when PAPI indicates 2white-2red. (Exact Center-line of PAPI Glide Slope. I know approximately 0.4 of marginal has exist on PAPI for 2White-2Red (2.81-3.19)
If the last one's word is true, an airport have a 7.75 GS, like a KSBS Airport, then the PAPI of KSBS airport indicates 2white-2red when I follow the 7.75 GS ?
Waiting for your answers. Thank you.