GPS on phones accuracy

[Skeptik]

well if you do want a accurate GPS, you rather get a LD-4W, my friend Michael reviewed it few days ago at Symbian-Freak
http://symbian-freak.com/news/008/02/nokia_ld-4w__know_your_position.htm

The Difference between the LD-4W and the internal GPS on my Nokia N95 (where i mainly tested) are 2 important Things: Speed and Precision!

I can see how he tested Speed of aquisition and startup but how do you measure precision. Sounds like a thumb-suck to me.

 

[eagle-slayor]

thumb-suck? what does that mean...you can see I'm portuguese lol

 

[Skeptik]

thumb-suck? what does that mean...you can see I'm portuguese lol

It means just taking a guess without scientific reasoning or testing.

 

[Vlad_M]

I can see how he tested Speed of aquisition and startup but how do you measure precision. Sounds like a thumb-suck to me.

A GPS will always give you it's accuracy. Which is the same as precision, and quite empirical.

 

[Skeptik]

A GPS will always give you it's accuracy. Which is the same as precision, and quite empirical.

So how can you compare two consumer receivers for precision. I wouldn't be surprised if they had exactly the same chipset.

 

[swim]

You mean if you have GPS you don't look out the windscreen?

knight rider

 

[Geoff Ogden]

How do you know you out by 3 meters?

It comes down to the fact that the GPS receiver determines it's position by 'triangulation'. The GPS calculates the distance from all the 'Sat's' and where these distances cross the lines form a triangle. The GPS is somewhere in the 'middle' of this triangle. For normal use, such as driving, the 5 meters will normally take you no further than the other side of the road.

 

[mancombseepgood]

http://www.how-gps-works.com/faq/q0110.shtml
How does triangulation work?

 

[Skeptik]

It comes down to the fact that the GPS receiver determines it's position by 'triangulation'. The GPS calculates the distance from all the 'Sat's' and where these distances cross the lines form a triangle. The GPS is somewhere in the 'middle' of this triangle. For normal use, such as driving, the 5 meters will normally take you no further than the other side of the road.

Exactly, a cocked hat. But the size of the hat varies.

 

[3Gee]

well if you do want a accurate GPS, you rather get a LD-4W, my friend Michael reviewed it few days ago at Symbian-Freak
http://symbian-freak.com/news/008/02/nokia_ld-4w__know_your_position.htm

LD-4W , not to found anywhere in SA yet , i have been looking for a while now for this device

 

[Geoff Ogden]

LD-4W , not to found anywhere in SA yet , i have been looking for a while now for this device

There are millimeter accurate GPS units avaiable in R.S.A.

The cheapest are called 'Post Processing DGPS' and start at aroung R53k.

 

[simple_simon]

There are millimeter accurate GPS units avaiable in R.S.A.

The cheapest are called 'Post Processing DGPS' and start at aroung R53k.

i'll rush out and buy 5 right now.

 

[Geoff Ogden]

i'll rush out and buy 5 right now.

What's worse is that they are pretty useless for general navigation. Also only 5 meter accurate when used as a stand alone. The accuracy comes from the 'post processing'

 

[eagle-slayor]

you should buy if you own airplanes or something

 

[Skeptik]

you should buy if you own airplanes or something

Not necessary for aircraft unless you are doing a precision approach and then you would need WAAS.

 

[eagle-slayor]

lol...im really gonna need that if the pilots faint or are sucked out of the aircraft