[OSM-newbies] Detect WAAS/EGNOS mode

[Iván Sánchez Ortega]

El Viernes, 25 de Abril de 2008, Jeffrey Martin escribió:
> Thanks, I'll look for that D, but is it increasing the accuracy?

It should. By using Differential GPS, you're compensating for some of the 
sources of inaccuracy. e.g. you're being told how much drift you are 
experimenting because of the ionosphere, and try to compensate for that 
drift.

You can never be sure that your accuracy will be better. It's statistically 
better, though.

But, for example, you can get caught into an urban canyon, drift to one side 
due to poor reception, then drift even more while trying to correct the drift 
data from D-GPS information. It's hard to tell if you're not heavily into 
linear equations and all that pretty stuff inside GPSs.

> Will the accuracy reading on the GPS change?

Depends on your GPS. My Navi, for example, says that the Dillution of 
Precision is exactly *zero* when it gets a WAAS/EGNOS signal. With a Garmin, 
YMMV.


Cheers,
-- 
----------------------------------
Iván Sánchez Ortega <ivan at sanchezortega.es>

Un ordenador no es un televisor ni un microondas, es una herramienta compleja.
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