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#1
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GPS on aircraft
I often take my GPS with me when I am on a commercial plane as I also
use it in my own plane. I always have people around me come look at my screen to see where the plane is... On a recent trip, I said something to one of the Pilots on the way out about the GPS. He said my GPS (ala Delorme on my laptop) was probable more accurate than the 10 year old instruments on the aircraft. the Delorme software cost onlu $100 at Officemax or Fry's Electronics I have both the street atlas version and the topo version. the GPS told me at what altitude, heading and also the aircraft speed -- JOHN 888-5-analon (888-526-2566) computers (unix admin), chemistry, and Freggs too I make it work. X-windows, not MSW ! |
#2
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GPS on aircraft
jamoran writes:
On a recent trip, I said something to one of the Pilots on the way out about the GPS. He said my GPS (ala Delorme on my laptop) was probable more accurate than the 10 year old instruments on the aircraft. If there is no GPS on the aircraft, that may be true, for long distances. Inertial systems are extremely precise after initialization, but since they rely on dead reckoning, they drift substantially over long periods. Radio aids are more accurate for landing guidance than GPS, but for the rest of the flight, nothing is more accurate than the inertial stuff, and the inertial stuff drifts, so at the end of a 10-hour flight, even a consumer GPS may be more accurate. the GPS told me at what altitude, heading and also the aircraft speed The heading and speed are probably reliable. The altitude will be much less so (not nearly enough for navigation, as a general rule). |
#3
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GPS on aircraft
jamoran wrote:
about the GPS. He said my GPS (ala Delorme on my laptop) was probable more accurate than the 10 year old instruments on the aircraft. Not when used from a passenger seat. From a window, you have a very "two dimensional" view of the sky, so the 3d calculations have far lower accuracy because they do not have enough "3d" distance between satellites. It also takes longer for the unit to lock in (unless you estimate your position and force it into the GPS to help it make sense of the few signals it is getting. Once you have a lock, the speed, heading and postion are accurate from an airplane's point of view. (it isn't as if you're looking for a needle in a haystack, by the time you've looked at your current position, the plane has moved MANY metres away already) |
#4
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GPS on aircraft
"jamoran" wrote in message
.. . I often take my GPS with me when I am on a commercial plane as I also use it in my own plane. I always have people around me come look at my screen to see where the plane is... On a recent trip, I said something to one of the Pilots on the way out about the GPS. He said my GPS (ala Delorme on my laptop) was probable more accurate than the 10 year old instruments on the aircraft. the Delorme software cost onlu $100 at Officemax or Fry's Electronics I have both the street atlas version and the topo version. the GPS told me at what altitude, heading and also the aircraft speed I also have the Delorme and I also managed to configured it to work with MS Streets and Trips. I've used it on Carnival cruise ships on the Mississippi River and Gulf of Mexico. http://public.fotki.com/apjung/vacat.../dsc02167.html http://public.fotki.com/apjung/vacat.../dsc02340.html I didn't use it for my recent flight from New Orleans to Taipei because I got a TomTom One during Black Friday 2007. I kept it powered with Energizer Energi To Go. You just can't fit a regular laptop on a tray table in Steerage. http://tinyurl.com/6zufnj -- Andy P. Jung Metairie, Louisiana U.S.A. (on the Western side of the now infamous 17th Street Canal) http://www.JungWorld.com/ To reply via e-mail, please visit my web site. |
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