I am sure that I am just not looking in the right place, but I can not find the answer in any of the manuals.In the second FSX tutorial (KORD to KJFK) on Page 35 it says to set the BARO to 800ft ASL on the PFD or if you want to set a decision height instead use 787ft AGL.Now the questions:What is ASL and how do you know to use 800ft?What is AGL and how do you know to use 787ft?Rod Storer

ASL - Above Sea LevelAGL - Above Ground LevelThe BARO knob is the same knob you use to set your radio minimums, but you need to rotate the cuff (your mouse icon will turn grey when you're about to click in the right spot). Setting the BARO altitude takes care of the MDA (minimum descent altitude - given ASL) alert, while the radio takes care of the DH (decision height - given AGL) alert. You may use either in the case of this approach. The altitudes come from the bottom of this chart:http://204.108.4.16/d-tpp/1104/00610VG13LR.PDFThe larger-print number (800) is the BARO altitude or MDA, whereas the smaller print number to its right (787) is the DH.

Hi Rod,ASL - Above Sea Level, AGL - Above Ground Level.The difference between the two is on account of the elevation of the runway itself above sea level. In this case it's 13ft. The actual height above the runway surface is effectively the same, it's a matter of whether it is gauged by the traditional altimeter (ie based on air pressure) or by the Radio Altimeter (i.e. determined by radio waves being sent to the ground and bouncing back up to a receiver on the aircraft underbelly).The value to set is determined by reviewing the approach chart for your selected procedure. Precision approaches generally have a lower minimum value, whereas non-precision, non-straight in or circling procedures have higher minima.Cheers,

Thanks!Rod Storer