Originally Posted by olografix
Hi Detroit Doug, I'm in a office building, mainly concrete I guess. I never lose signal at my desk, a constant 2 to 3 bars on EVDO. As soon as I go outside, I get a sat lock in about 20 seconds, so no complaint there.
My question is aGPS should be using data transfers and triangulation to help determine location, right? If I disable GPS on my device, will aGPS kick in? I doubt it'll work, but I'm willing to play around with it. Is there a way to know "which GPS" is trying to function and determine location?
Tell me if I'm getting this complety wrong!
Firstly you do NOT have GPS on the phone, there is no "true" GPS chip-set/antennae within the phone itself (think Garmin, TomTom, etc) to my understanding aGPS (assisted Global Positioning System) utilizes a form of triangulation from your cell tower network and positioning by a form of pinging the towers for timing then doing the math it calculates your distance from each and gets an approximate location. (this is all guesswork on my end havent spent the time to actually confirm this info)
Ive noticed in locations around here (Im in Las Vegas) if I am having issues with obtaining locks I make sure auto roam is enabled on the phone, soft reset and try again, takes a while because of the nature of the beast it will attempt a home network connection first then drop to roaming so be patient (and make sure you have a proper plan as roaming will make for a huge bill at the end of the month
Originally Posted by ScrapMaker
If your carrier is doing aGPS properly, then you can get GPS, assuming you have cellular signal. If your building is blocking your cell signal, theres pretty much a 0% chance that you will get TRUE GPS either.
That being said, HTC devices don't seem to REALLY do Sprint aGPS. On my M1, which has a similar hybrid aGPS chip, I could get locks in the bottom floors of hotels, in thick concrete buildings, and other crazy places, and it never took longer than 2 seconds to get a lock.
With the Vogue, it takes anywhere from 5 seconds to 20, assuming you are outside, or in a friendly building--near a window/etc..
I miss the true aGPS I sat my phone next to my co-worker's Instinct, in one of our server rooms, and both opened up Sprint Navigation. His locked in less than one second, and mine never locked--ever.
Ive never had to wait to long for a signal since the 1.07 ROMs of NFSFAN (or a select very few other Chefs ROMS either) and Sprint (my carrier) used to be the big dog locally here but as since dropped by the wayside and has been difficult to utilize aGPS of late but this series of ROMs have had no issues obtaining both fast AND accurate locks (accurate per the warning on software e.g. google maps, MSN Live, etc of the accuracy being within so many meters of actual location)
Personally, Footprints and even more so Google Maps w/Latitude are geek toys for me, not saying that they are not useful for someone whom would actually utilize it fully (road warrior sales types, vendors and the like) but for the average user working in an office or tech center (as I do as I am in the IT field) but they are not of use other than a shiny coolness factor simply as I know where all my PC's, Printers, Servers and the like already are and dont need a footprint to determine a photo/location map LOL and I wont even go into the security issues of google's latitude (look it up its an interesting read) and how it was released without really thinking about or having in place a secure and safe ability to only allow certain users to know where you are or your family are...
I agree with ScrapMaker though it is NOT true aGPS nor was it intended to be moreso a new way to utilize an aGPS like service with lower cost and lower power configurations.