On 3/26/07, Alan B. Pearce wrote: > >(*** 2499m ??? !!! Who measured that ?) > > Sounds like there was some civil aviation set ceiling at 3000m he couldn't > fly above ;) There's always the possibility there's a much simpler solution here... They may have taken along a "calibrated" altimeter certified by ICAO. Yes, the device has limitations that mean the "measurement" isn't as accurate as the final number makes it appear to be... but... When you're shooting for records, the ONLY thing that counts is the so-called "certified" altimeter. If it reads a max of 2499m... then that's your record. Doesn't matter if the number is silly or makes it appear like the instrument can actually measure accurately to within a meter with no errors... it's what the certified instrument said. End of story... at least as far as the ICAO is concerned. But... I'm just guessing here... I have no idea if he was carrying a so-called "certified" instrument or attempting to set any official records. Another possibility... an analog altimeter with a high altitude needle... they land, look at it and say, "Well... you can see that's not exactly 3000m... it's a hair lower..."... [pause]... "Oh hell, just call it 2499m and let's go home. We did something no one else has ever done today... that's good enough. Let the PICList argue as much as they want about it later." :-) Nate -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist