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Thread: GPS on Airplane

  1. #16
    Alps Adventurer GlobalRider's Avatar
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    Quote Originally Posted by 76650 View Post
    Mach 1.48... that is impressive! I'm thinkin it wasn't commercial....
    Mach 1.48?

    Hard to make out but I think that indication is in km/hr which would make it 700 mph.

    Besides, that would be a ground speed, not airspeed.

  2. #17
    I like TANG! bubbagazoo's Avatar
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    Quote Originally Posted by 76650 View Post
    Mach 1.48... that is impressive! I'm thinkin it wasn't commercial....
    What GlobalRider said. Good tail wind that day.
    Robert
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  3. #18
    Slowpoke & Proud of It! BRADFORDBENN's Avatar
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    I can understand why people get nervous about it. The one that really cracks me up is when I am asked to turn off the mapping software on the laptop.
    -=Brad

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  4. #19
    1150rs enthusiast groundeffect's Avatar
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    The GPS is a receiver only and does not transmit RF. -doesn't interfere upfront.
    The main consideration is public perception imo- passengers may get suspicious if
    they don't know what it is.
    Cheers

  5. #20
    Loose Cannon flash412's Avatar
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    Quote Originally Posted by groundeffect View Post
    The GPS is a receiver only and does not transmit RF. -doesn't interfere upfront.
    Your GPS has a local oscillator.

    How do you think radar detector detectors work? They sniff out the local oscillator.
    The main consideration is public perception imo- passengers may get suspicious if
    they don't know what it is.
    This is why asking the flight attendant to ask the CAPTAIN if it will be ok to use your GPS above 10k feet works so well. It teaches the flight attendant as well as your fellow passengers that you have a GPS and that it IS safe to use.

  6. #21
    Chairman of the hoard wmubrown's Avatar
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    Quote Originally Posted by GlobalRider View Post
    Mach 1.48?

    Hard to make out but I think that indication is in km/hr which would make it 700 mph.

    Besides, that would be a ground speed, not airspeed.
    The units are miles... just some bizarre fluke... honest, I wasn't traveling that fast officer!
    John A. Brown - Kalamazoo MI
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  7. #22
    Alps Adventurer GlobalRider's Avatar
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    Quote Originally Posted by wmubrown View Post
    The units are miles... just some bizarre fluke... honest, I wasn't traveling that fast officer!
    I've seen that happen on my unit a few times.

    It must happen when the unit momentarily loses lock and places you some distance away while still computing...so it sees you as having moved a great distance in a matter of seconds or a minute. And it being a "max hold" function, it stores the highest reading.

    But I have a groundspeed of 1077 km/hr (669 mph) recorded on my GPS. Flying (east) from Montreal to London-Heathrow you get the jetstream in your favor, so a higher groundspeed.

    Having flown for a living, I like to tinker while flying like get a revised ETA (unless they put you in a hold). I had this surprised look from the captain upon arrival at LHR when I asked him if were were heavy or what on takeoff. Rolling down 24R at YUL we didn't rotate till after the 10-28 intersection...and thats at the very very far end of 24R. I was wondering if we were going to be part of the terminal buildings.

  8. #23
    1150rs enthusiast groundeffect's Avatar
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    "Your GPS has a local oscillator."

    The Local oscillator in this case is not in the harmfull range to affect avionics.
    Older cellphones in the 400 khz range, can affect older avionics such as localizer receivers...in a glass cockpit, as in the case of most modern Airlines, it is a moot point anyway.

    You are correct, ask the F/A..she'll pass the querry along to the guys up front..we generally welcome such requests.I personally have always allowed passengers to use their GPS' onboard.
    Last edited by groundeffect; 04-18-2007 at 09:59 AM.

  9. #24
    Registered User bluehole's Avatar
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    Well, I am back. No problem. I did not try to get a signal unless I was at a window seat...I got a signal, but it took some time. No problems from the crew (USAir). I just waited until we were told it is okay to use electronic devices. I was sitting next to my kids or alone so no one was right on top of me watching. It is fasinating to see where you are, the route you are flying, the towns and interstates, etc. Top speed was in a 757 @ 614 MPH. The top speed in the smaller jets was 441 MPH.

  10. #25
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    my Zumo works great!

    zumo is quick to boot up even from a non-window seat and works flawlessly.

    All airline aircraft have a minimum of two gps's up front. Also, for what it's worth, during my flying days I experimented with all types of phones and send/receive radios, transmitters etc. held against both the instrument and the RT units of my aircraft and was never able to get a tiny wiggle out of the needles during any phase of the unit's operation. On the other hand the older Tacans had a nasty habit of giving a 60 degree false lock on all by themselves.
    Last edited by lawman; 04-14-2007 at 05:32 PM. Reason: typo

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