05-24-2003, 10:15 PM
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Join Date: 05-10-2003
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Location: Orlando
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PDAPhone: HTC Touch Pro
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Carrier: Sprint
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Headset: Any Suggestions?
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746 |
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Re: GPS Service
Quote:
Originally posted by "juttonn"
The GPS service referred to by cell phone companies is a system that allows emergency response teams to locate you when you call 911. It is server-side and uses some sort of triangulation between cell towers (that's my understanding anyway). From what I've read, it locates you within 100 yards to .5 mile or so. The service is not pinpoint and doesn't update in realtime (there is a considerable lag). This makes it usefull for an ambulance to know basically where you are lying in the middle of the road injured, but makes the use of the service for mapping/direction applications pretty much useless.
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The emergency location service that is based on triangulation is accurate to about 300-500 feet (E-911 Phase 2 and trialed for possible Phase 3 use but no one could make it accurate enough for the FCC mandate). The FCC mandate is that it be accurate to 20 feet for E911 Phase 3. I believe all the players have gone to the GPS chip intigrated into the phone due to this, the GPS chip is exactly that while it wont give you the 3-10 foot accuracy you get from a true GPS device, it will narrow it down to where you would be practicly standing on top of the person in an emergency situation. As far as I know there isnt any way to pull the data from the phone to use with GPS maps. Some phones do have the ability to display the info in text format (Lat, Long) but it is in the settings so the phone function would be disabled if you are viewing it because it is in the Programing settings. |
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