Quote:
Originally Posted by jethro_static
Ok if u insist. I want more people to read it though well anyways here's just a simple explanation why. Most of the phones that have GPS chip in it uses A-GPS technology. I know your familiar with that already. A-GPS has 4 types including the standalone. Standalone does not need a data plan. If u don't have AT&T tilt, moto Q9c and blackberry device, U don't have a standalone chip on ur phone. So for the rest of us, we will pay for data. U ask why do we need data? Well this is how it works. The GPS satellite will locate ur position. The satellite then communicate with cell towers about ur whereabout. Then the info will be processed at a nearby A-GPS servers. The A-GPS servers will then transfer the computed data to ur phone. Now you ask, Why does the A-GPS server do the computations? Because they have a significantly more powerful processors than ur phone.It's faster when they do the computations. And most importantly, To save your batery. It will drain your batery doing this calculations. Now U ask, So where the data plan comes in place. Here's your answer. How will the A-GPS servers transfer the DATA to ur phone? here are your options, Voice plan? test messaging plan? Or DATA plan? Now you tell me how to transfer Data to your phone if the answer is not in the 3 options? yah digg? if U do. Hit that T.
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From my experience, some GPS proggies get a fix without data via the network. The chipset is detecting the radio signals from the satellites, and with 4 or more, you get a great triangulation from that alone. You then need the maps relative to that spot. If I have maps on my stoage card, (Garmin, IGO, TOMTOM) I can still navigate. For some unexplained reason last night, I couldn't get on the internet on my phone, but I was able to use tomtom. I know for a fact I was disconnected from any data that I get from my data plan.
EDIT:
Oh yeah, these programs warn you when they want to connect to the internet for traffic updates or extras. They want to make sure you're ok with using your data plan or they say they say you can't use these features without a data plan. I think you may be right about AGPS, but it doesn't use your data plan, it uses the 3.37 (or other) radio's frequency and doesn't require DATA. it just has to read a frequency that is in the air. I can look at deatailed satellite info in IGO and its not telling me where the satellites are relative to the cell tower relative to me. Its not triangulating off of the cell towers. If it was, I'd never have a problem getting a GPS fix because I'm indoors. I'd have problems because I can't read 3-4 cell towers.
I'm new here, but not totally noob.