pingu123, on Oct 3 2007, 13:53, said:
Thanks for your reply Neil. Sorry about delay in replying-for reasons see my reply to other posting! I was wondering if you could clarify the technical side of this for me?? On the back of my xda orbit is a plastic molded area with gps embossed into it. The manual suggests this is the gps receiver. There are a couple of small slots just above it, with a mesh of some sort behing them, perhaps that contains a sensor or something. I'm just trying to understand the physical side of the technology, so I can be sure I'm exposing the receiver correctly!
I went outside with my orbit, and held it up, exposing this area of the pda to the sky, for a good 10 minutes. I have also tried several different programs including quickgps. None made any difference.
As you can see from the posting, the writer of Gridhiker has responded to my plea. I plan to investigate the new version of Gridhiker,this weekend, as he has tweaked it for Orbit's , it has a user manual (which will hopefully give me the correct settings) and is most suitable for my purposes.
Hi Linda- shame about the Orbit screen, but good that O2 replaced it!
The GPS in the Orbit (any GPS for that matter!) receives its signals direct from the orbiting satellites, just as any radio receiver does, so it doesn't matter about pointing the Orbit in any particular direction. Its just that satellite signals are very weak, and often can't pass through walls; even heavy tree cover can interfere, as can high buildings, which is why going outside with a clear sky view is useful for a 1st fix
Satellites send out 2 types of data- Emphemara and Almanac. The former is changing data like time of day, sunrise/sunset etc and the latter gives data about the satellite's identification codes, the ID of it's neighbours etc. When you first use a GPS, it has to download all that data; Once downloaded, and assuming your positon, or time of day hasn't changed radically since the GPS was last active, a lot of the data will still be valid, and won't need redownloading.
QuickGPS is not a GPS program in itself
It uses the phone side of things to send a request to HTC's servers. and downloads some positional data via the Internet, based on your phone's cell position. The results are variable- it can give a faster satellite lock, but it is only a matter of a few seconds to a minute or 2.
You would be advised to use GPSInfo, a small app that HTC used to include. I'll attach it here- just copy the exe file to your Orbit, then run it by opening a file explorer, and tapping GPSInfo.exe. Set up the input for COM4 and 4800 Baud, and you should see a whole list of text scrolling in the 1st screen, as data is downloaded. The 2nd screen will give a graphic of how many satellites can be seen, and how many have a fix (outline bar= no fix; solid bar= fix). A 3D fix needs at least 3 solid bars. This process can take up to 20 minutes, so be patient!