Originally Posted by
Capn Bloggs
Me too, Leddy!
In the document that you told me to read, perhaps
you could do a search for "
maritime jurisdiction". That might give a clue as to why.
It's not $225m for the SBAS, it's $160m. The extra is for the 3cm accuracy.
Nobody's answered me yet; how is the LPV DA displayed/used/worked out in the cockpit? Using a rad alt?
The DA works just the same as on an ILS.
An SBAS capable GPS with a vaild SBAS signal and a LPV approach loaded will allow the vertical deviation indicator to be displayed on an EFIS, or respond on a steam gauge just as it would with a valid glideslope on an ILS. DA is read off the altimeter just like the ILS. Simples.
You could use a Rad Alt too if you were so equipped. In my experience an Rad Alt is a very poor way to determine DA or MDA for that matter.