North American Network Operators Group
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Re: Vonage Selects TCS For VoIP E911 Service

  • From: Mikael Abrahamsson
  • Date: Wed Jul 20 09:23:08 2005 
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: [email protected]