Assisted GPS and Tomtom problem

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I noticed like most that the assisted GPS is switched off be default out of the box. I decided to switch it on today and while using Tomtom I noticed every 2-3 seconds the gps signal would come on and off. It was just as though the GPS receiver did not exist. I tried a soft reset without luck. As soon as I disabled AGPS, Tomtom functioned perfectly.

Any suggestion on what could be the cause or did HTC deliberately disable AGPS because there is some problem with it?

Thanks

could someone possibly swtich on their assisted GPS and let me know if it holds the sats with tomtom

Originally Posted by fortune500

could someone possibly swtich on their assisted GPS and let me know if it holds the sats with tomtom

Have just done as requested on my device (using Advanced Config to enable it) and can confirm I see identical results as you;

- Assisted turned OFF (out of box): works fine
- Assisted turned ON: works for a few seconds, "No GPS device", works for a few seconds, "No GPS device", and so on

Also, I have found that no matter whether the above is turned on or off I am unable to get a position fix indoors (ie. next to window) - something I believe A-GPS was supposed to be able to do?

Very strange.. not least that it is disabled out of the box? Ideas anyone?

I've just received my diamond so I haven't tried it outdoors yet, but I can confirm that it's practically impossible to get a signal indoors with a-gps on. I turned it on first, so haven't tried it when it was off. Other gps receivers didn't have that much trouble to get reception near the windows. Will test some more outdoors with gpstuner which shows some more info than tomtom.

Originally Posted by fortune500

I noticed like most that the assisted GPS is switched off be default out of the box. I decided to switch it on today and while using Tomtom I noticed every 2-3 seconds the gps signal would come on and off. It was just as though the GPS receiver did not exist. I tried a soft reset without luck. As soon as I disabled AGPS, Tomtom functioned perfectly.

Any suggestion on what could be the cause or did HTC deliberately disable AGPS because there is some problem with it?

Thanks

I agree with you as well. Today I was using Destinator 7 and had the exact same problems. It's like instead of using sat navigation, it's using the GSM signal and thus the map moves every 100-200 meters after the car has passed. Once the A-GPS is off, the program is flawless

Where do I turn on A-GPS? Is it the same as QuickGPS?

Same problem I had when I tweaked with Advanced Config... quickly figured that was the cause and turned it off.
It's quite quick and acceptable with sat locking so its no biggie.
I also think that the program that comes with the diamond to download a map of the sats helps a lot more then agps.

testing on my D-nd with TT and Garmin

it will work if you set the baud rate in TT to 2400. Otherwise turn agps off and it works at the regular setting. Haven't really notices a difference in performance one way or another.

Originally Posted by jehlinger

it will work if you set the baud rate in TT to 2400. Otherwise turn agps off and it works at the regular setting. Haven't really notices a difference in performance one way or another.

Thanks for the above tip.

Have just made the baud rate change, and will test whether or not it works for me on my way home this evening.

However what I can report is that I am unable to get any 'lock' indoors (however approximate - ie. TomTom is reporting the normal "no valid GPS signal"), this being one of the benefits I thought A-GPS brought (ie. using phone mast information to provide an approximate fix when normal GPS was unavailable / weak). Has anyone actually provided the "A-" is providing benefit???