Google Maps with My Location (Beta)

[TC1]

Originally Posted by Malatesta

aGPS uses your location merely to tell the device what satellites (out of dozens, a lot are not relevant) to look at for data, reducing signal acquisition. It also can help compute the GPS data for faster location identification.

I know we've been over this, but again, based on real world experience and developing apps, this is not entirely true when it comes to CDMA cell phone application of aGPS.

Your statement above implies that aGPS is simply used to assist a satellite based GPS device, correct? I've unlocked my wife's LG Fusic which has NO stand-alone GPS capability, and installed mGMAPS which accesses the Java aGPS API. The accuracy provided is less than about 50 feet... I can literally walk around my house and around the block and the map will follow me precisely at a street level view. In this case aGPS is using the Assistance Server data that is on the carrier's network, the same thing that is available to e911. This data is very precise (but not as good as true sat-based GPS) because it uses data from multiple towers.

The application and the phone are using aGPS with NO sat-based data from the phone. And it's pretty precise.

Malatesta, I noticed you're on Long Island... I'm in Nassau County. If you ever want to discuss cell phone issues and GPS in person let me know. The sharing of knowledge is always a good thing