debcook

2008-07-20 17:06:46 

FYI – I finally received my shipping confirmation for my new 3G iPhone! I should have it in hand by tomorrow afternoon.

With that out of the way I want to talk about the A-GPS (Assisted GPS) that is included on the 3G iPhone. Although this feature is found on other cell phones I am really anxious to see it on my phone.

What is A-GPS? First of all it is the real thing. GPS devices typically triangulate your location by receiving signals from at least 3 or 4 satellites orbiting high above the earth. A direct line of sight to the satellites is usually required for standalone GPS units such as Garmin and TomTom. A-GPS works much the same way except in a more versatile way.

The advantage of A-GPS is that if you are inside a structure triangulation is accomplished via WiFi or cell phone towers. If you are outside in the open the Satellite option is also available. Triangulation happens faster on a device running A-GPS (such as the iPhone 3G) because Assisted Servers are accessed. These Assisted servers already have GPS information computed and the A-GPS system taps that information so further triangulation happens faster.

Sure, there are fewer bells and whistles on this type of GPS device when compared to the standalone devices but they job gets done just the same. Your location is pinpointed, you can search Points of Interest (POI) by keyword and you even get real time traffic information. Turn by turn directions lead you to your destination or if you prefer you can watch your movements by following the blue flashing light.

Hopefully my new 3G iPhone will save me the expense of a standalone GPS device. I’d rather pick out my next new electronic gadget according to another need I surely have.