Why are you guys trying to calculate something depicted on the chart ? 1.9 NM from ISAB
Alright to make things clearer , there are 2 arrows UP ( representing the missed approach point) indicated in the vertical profile . The closest to the runway located at around 0.5 nm from threshold corresponds to DA for a full ILS
The arrow with a M indication located at 1.9NM from ISAB is the location of your missed approach point when flying a localiser procedure. This is where you go around if visual references have not been established , Also it is the point where you should continue , if visual contact has been established , hence VDP.
Why make things complicated?
But it seems like VDP is not understood at all. VDP concept was established for OLD procedures where you could have the missed approach point located beyond the 3 degrees path , or beyond a deCent point to continue descent , which would inevitably lead to unstabilised approach should you decide to continue , for instance you could find Missed Approach Point over threshold on some old dive and drive procedures. Imagine flaps full gear down , leveling off until the threshold , seriously don't you think you will end up unstabilised ? Hence there was a requirement to establish a VDP that coincided with the normal decent
And this VDP was your new missed approach point . VDP was developped to permit stabilisation criterias .
Where the missed approach point coincides with the normal continuous descent , there is no need of VDP as the missed approach point itself , M , is a VDP , it is when you reach MDA , from there on , if visual , you will continue a normal descent to landing .
Last edited by Citation2; 12th Oct 2016 at 11:08.