* Posts by David Leeming

3 posts • joined 10 Jul 2007

iPhone 3G isn't necessarily

David Leeming


My god, there is such a lack of understanding of GPS, A-GPS (assisted GPS) and "other" positioning systems by use of triangulation of cell towers or wifi spots.

Firstly the iPhone (and iTouch using a db of wifi spots) can roughly locate your position using a triangulation of signals from cell towers, which in itself is quite a bit of funky technology. This is *NOT* GPS in any form, assisted or otherwise.

Secondly, the iPhone 3G has a full blown GPS chipset in it, so can get your position down to a few meters. But, like all GPS units it has to download all the ephemeris data from the satellites. This can take up to 10 mins for a unit that has no knowledge of its position at all.

A-GPS is superior to plain old GPS and don't confuse it with other things. That makes Greg the owner of the

This is where *assisted* GPS come in. It connects to the interweb and downloads all of the satellite data from a server somewhere at web speed not at 50 BITS/sec that it takes from the sat itself. Now, equipped with all that data, you get a fix very quickly.

That makes Greg the owner of the stupidest comment here.....


BT matches analysts' forecasts

David Leeming

It's not that bad

"So how come none of the providers actually provide anything higher than 4mbps, on a good day?" - is a total BS statement.

I'm not going to say the UK is fantastic, and I'd agree that BT has a lot to answer for, but statements like that are just rubbish. I have a consistent 14mbps at home through Be* and very happy with it.


Is your phone free?

David Leeming


"I mainly use a Windows Smartphone for GPS. If this gets some GPS software it would be useful. If not then I'll get a Tomtom unit."

Tomtom one was/is Linux based. In fact Openmoko uses some of the GPL code written and released by Tomtom.

I give it a week before you can download a version of TT for this beauty.

I put my order in within hours of the announcement. I can ditch my horrible WM5 device - well the hardware is ok, but the software (TT aside) sucks big time. Let UPS gods deliver my FIC1973 quickly!