Question: RVR in the rest of the world
I was just looking at the Jepp plate for the 27L ILS at Heathrow and noticed that where you would usually see 0.8km as the visibilty requirement at the DA on an Australian plate, it only shows an RVR of 550m, then 750m and finally 1200m respectively under headings FULL, LIMITED and ALS out.
Can any international guys comment on what the difference is here? I'm used to thinking about minima as a visibility requirement from the air, however isn't RVR a visibility on the runway centreline? How can you make a decision on what the RVR is if you're not on the runway>