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HP iPAQ 910 Business Messenger


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What about the GPS?


Sep 6, 2007, 6:08 PM
I noticed that the phone is listed as "A-GPS" and not
Standalone GPS" like my current iPAQ hw6515. Will my TomTom software work with this, or will I have to get one of those darn BT GPS hockey pucks? The thing I really liked about the iPAQ was the built in GPS.

Rich Brome

Sep 7, 2007, 2:39 PM
Assisted GPS doesn't necessarily mean it can't work standalone. Some A-GPS phones require the assistance from the network, but others - like this one - can work independently as well. When it does operate in assisted mode with a compatible network, that simply provides faster and more accurate performance.

Sep 16, 2007, 4:39 PM
so why doesnt more gsm phones take advantage of the A-GPS... or does this use the WCDMA network??
Rich Brome

Sep 17, 2007, 8:48 AM
I've only heard of A-GPS on WCDMA networks, not GSM. I don't think any US WCDMA networks support it yet.

Sep 24, 2007, 12:48 PM
My iPAQ 6515 seems to have this feature, on a GSM EDGE phone. Every 2 days it has to download a "GPS Quick Connection" file.


Rich Brome said:
I've only heard of A-GPS on WCDMA networks, not GSM. I don't think any US WCDMA networks support it yet.
Rich Brome

Sep 24, 2007, 1:47 PM
Right. My understanding is that it has to download new GPS "almanac" data every two days because it can't get the more accurate but time-sensitive "ephemeris" data in real time (which would be true assisted GPS). New almanac data every two days should allow it to get a lock in 30 seconds or less (but definitely up to 30 seconds sometimes.) With true A-GPS, it would be faster (never nearly as long as 30 seconds.)

Dec 4, 2007, 4:29 PM
I don't believe A-GPS can work stand-alone.
From all the research I have done to figure out whether or not to get this phone it would seem AGPS is not accurate enough to work stand-alone.

If you notice the 910 is lighter than the 6925/45.
That is because the AGPS radio is a lighweight compared to stand-alone gps. Also this may even make the 910 cheaper or similar in price to the 6900 when it is finally released.

Their is even a debate out there as to whether AGPS can deliver what it promises in terms of significantly more accuracy over stand-alone GPS.

It seems the carriers are pushing for a-gps in their phones so they can shake-down customers for money.

What we pay for cell services in the US is simply highway robbery.


Oct 5, 2008, 12:43 PM
re: AGPS, please read my post in the "GPS questions and in general questions..." thread.

quoting from Broadcom (who owns the patents for the GPS Quick Position technology)...

LTO (Long Term Orbits technology) ...

"A device using LTO computes fixes sooner, has
better initial accuracy, and provides superior
weak signal performance versus a device
capable of autonomous mode only. Unlike
traditional AGPS systems that demand regular
network connectivity to maintain ephemeris,
devices using LTO can operate for up to four
days out of network, should the need arise.
These features are key to operating in urban
environments, where downloading ephemeris
directly from the satellites or getting access to a wireless network for assista...

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