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int_ua is offline int_ua
2010-09-11 , 23:37
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#11
Originally Posted by pwm View Post
With GPRS/3G/WLAN/BT off, it is almost silent. Yes - as all other electronics, there is a bit of EMI from the processor, any AC/DC, oscillators, ... But not much different from a more powerful graphical calculator or small game console.

But why are you asking? And by the way - it doesn't hurt if you use full words in your sentences.
It might seem very weird, but I'm mapping out my actions in case of military operations at my location.
Not that I think it is so possible, but it never hurts to be prepared.

Sorry, didn't understood the last sentence. What words?
 
j.s is offline j.s
2010-09-12 , 00:03
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#12
Originally Posted by int_ua View Post
It might seem very weird, but I'm mapping out my actions in case of military operations at my location.
Not that I think it is so possible, but it never hurts to be prepared.
Radio transmitters are, of course, the least "radio silent". And, as you mentioned, computer clock signals also cause radio signals.

GPS recievers and other (most) receivers have what are known as "local oscillators" that are used in demodulating received radio signals. These local oscillators act as weak radio transmitters. So, a GPS receiver is not radio silent.

This radiation has been used to detect radio receivers for many decades.
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TiagoTiago is offline TiagoTiago
2010-09-12 , 01:31
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#13
If you're planning on tracking your motion while on an airplane, i've read that many non-military GPS devices that aren't meant for airplanes are hardcoded to not get a fix above a certain altitude and/or speed to prevent people using them in missiles, this has caused some issues with homebrew weather balloons and disappointed some private pilots, dunno if it's the case with the N900 though.
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pwm is offline pwm
2010-09-12 , 01:38
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#14
All civilian GPS solutions have limitations on max height, max speed, max acceleration and max jerk. So you can't just go out and buy a GPS off-the-shelf and use to control a cruise missile.
 
TiagoTiago is offline TiagoTiago
2010-09-12 , 01:40
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#15
GPS without the A does work in offline mode, right? I'll try to remember to leave somthing like Mappero running tracking my motion next time i travel by plane to see what happens (i don't plan on tripping anytime soon though)
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pwm is offline pwm
2010-09-12 , 11:41
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#16
A "normal" GPS works offline.

The A-GPS implementation in several Nokia phones tends to have a lousy antenna. So they can have an evilishly hard time getting the initial lock. After the lock, you can turn off the A-GPS and continue using the GPS in offline mode. This means you can get a fix before getting on the plane.
 
Matan is offline Matan
2010-09-12 , 11:50
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#17
Originally Posted by TiagoTiago View Post
If you're planning on tracking your motion while on an airplane, i've read that many non-military GPS devices that aren't meant for airplanes are hardcoded to not get a fix above a certain altitude and/or speed to prevent people using them in missiles, this has caused some issues with homebrew weather balloons and disappointed some private pilots, dunno if it's the case with the N900 though.
N810 works in an airplane, with height, speed and position values appearing to be similar to the ones displayed on the plane's screens. It does seem to lose fix quite often, but not much different than in a car.

I did not try with the N900 yet.
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Matan is offline Matan
2010-09-15 , 18:30
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#18
An update: N900 (and Nexus 1, for that matter) GPS works in an airplane. As in the case of the N810, you need to hold it close to a window, and even then the fix gets lost very often, but it has no problems with speeds above 900 km/h and altitude of above 10000 m.
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ChoMar is offline ChoMar
2010-09-16 , 15:34
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#19
So, you can use the N900 to control a missile. (Someone who can build a missile and has the ability to code the software for flying an attack and things like that wont let himself be stopped by some gps-regulations anyway, i would assume)
But you can NOT use it if you are a secret agent or something and need to be completly stealth.
 
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tzsm98 is offline tzsm98
2010-09-16 , 16:05
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#20
Originally Posted by TiagoTiago View Post
If you're planning on tracking your motion while on an airplane, i've read that many non-military GPS devices that aren't meant for airplanes are hardcoded to not get a fix above a certain altitude and/or speed to prevent people using them in missiles, this has caused some issues with homebrew weather balloons and disappointed some private pilots, dunno if it's the case with the N900 though.
I packed my Nokia 5230-1c (Nuron) in my suitcase last air trip. When I unpacked at my destination I found my average speed to be in excess of 200 MPH, portal to portal. I guess some of it works at altitude. I've never been able to get a GPS fix from my seat in the cabin with the N900.
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