5 ms·

Can it though? The chips in 10$ AFAIK have hardware limitation built in to cut/fudge output on high (air traffic scale) speeds.

zaxomi 3y ago
Coordinating Committee for Multilateral Export Controls (COCOM) limits is 1,000 knots (510 m/s) and/or at an altitude higher than 18,000 m (59,000 feet). Commercial airliners usually have a service ceiling at about 40000 feet and a speed below the speed of sound (343 m/s). Even with a very strong jet stream of 100 m/s it's below the limit. The Concorde had a service ceiling of 60000 feet and maximum speed of 605 m/s.
- dharmab 3y ago
  COCOM is technically AND, so you can buy some receivers which will work with one or the other condition.
wafflemaker 3y ago
You can use Open Street Maps to monitor the flight without the internet connection. I often use it to watch how the plane speeds up for take off and slows down for landing. Sometimes you have to keep the phone closer to the window. Luckily you get the list of currently connected GPS sats so you can debug whether hiccups are software/hardware related or poor GPS coverage. It's lot of fun observing how early planes start going down in altitude before landing or trying to guess river and city names from up top.
- sva_ 3y ago
  > luckily you get the list of currently connected GPS sats How do you get this list?
  - etskinner 3y ago
    The almanac, which is part of every GPS transmission https://en.wikipedia.org/wiki/GPS_Almanac?wprov=sfla1 https://en.wikipedia.org/wiki/GPS_Almanac?wprov=sfla1
    - closewith 3y ago
      GPS really is amazing. It's hard to believe it works at all.
      - fragmede 3y ago
        My favorite part about GPS is that it only works because we understand relativity, proving Einstein right.
        dharmab 3y ago
        It would work without an understanding of relativity, but the accuracy would drop by about a meter. https://physics.stackexchange.com/a/128951 https://physics.stackexchange.com/a/128951
  - mschuster91 3y ago
    Personally, I use GPS Toolbox. No idea about iPhones though. [1] https://play.google.com/store/apps/details?id=com.eclipsim.gpsstatus2&hl=de&gl=US https://play.google.com/store/apps/details?id=com.eclipsim.g...
davchana 3y ago
I have used Google's My Tracks (now defunct but apk still works) app, and Various GPS Speedometer apps at window seat to get the air speed and such for fun.

zaxomi 3y ago

Coordinating Committee for Multilateral Export Controls (COCOM) limits is 1,000 knots (510 m/s) and/or at an altitude higher than 18,000 m (59,000 feet). Commercial airliners usually have a service ceiling at about 40000 feet and a speed below the speed of sound (343 m/s). Even with a very strong jet stream of 100 m/s it's below the limit. The Concorde had a service ceiling of 60000 feet and maximum speed of 605 m/s.

dharmab 3y ago
COCOM is technically AND, so you can buy some receivers which will work with one or the other condition.

wafflemaker 3y ago

You can use Open Street Maps to monitor the flight without the internet connection. I often use it to watch how the plane speeds up for take off and slows down for landing. Sometimes you have to keep the phone closer to the window. Luckily you get the list of currently connected GPS sats so you can debug whether hiccups are software/hardware related or poor GPS coverage. It's lot of fun observing how early planes start going down in altitude before landing or trying to guess river and city names from up top.

sva_ 3y ago
> luckily you get the list of currently connected GPS sats How do you get this list?
- etskinner 3y ago
  The almanac, which is part of every GPS transmission https://en.wikipedia.org/wiki/GPS_Almanac?wprov=sfla1 https://en.wikipedia.org/wiki/GPS_Almanac?wprov=sfla1
  - closewith 3y ago
    GPS really is amazing. It's hard to believe it works at all.
    - fragmede 3y ago
      My favorite part about GPS is that it only works because we understand relativity, proving Einstein right.
      - dharmab 3y ago
        It would work without an understanding of relativity, but the accuracy would drop by about a meter. https://physics.stackexchange.com/a/128951 https://physics.stackexchange.com/a/128951
- mschuster91 3y ago
  Personally, I use GPS Toolbox. No idea about iPhones though. [1] https://play.google.com/store/apps/details?id=com.eclipsim.gpsstatus2&hl=de&gl=US https://play.google.com/store/apps/details?id=com.eclipsim.g...

davchana 3y ago

I have used Google's My Tracks (now defunct but apk still works) app, and Various GPS Speedometer apps at window seat to get the air speed and such for fun.