Re: Vonage Selects TCS For VoIP E911 Service

[Mikael Abrahamsson <swmike () swm pp se>]

On Wed, 20 Jul 2005, Andre Oppermann wrote:

> This is unlikely.  GPS reception is usually determined by sight of
> horizon.  For example the navigation system in my car has trouble

Looking at:

http://people.howstuffworks.com/location-tracking4.htm

"Phase II - The final phase requires carriers to place GPS receivers in 
phones in order to deliver more specific latitude and longitude location 
information. Location information must be accurate within 164 to 984 feet 
(50-300 meters)."

It does look like the requirements in E911 are designed around what can be 
done via cellphone based location services without GPS (ie some kind of 
distance to towers/angle approach).

--
Mikael Abrahamsson    email: swmike () swm pp se