GPS is stuck with a set of satellites - how to remove them from memory?

[ckl_88]

> Honestly I'm bit confused what's the relation between GPSmode # and
> EnableGPSSmartMode .. are not these setting redundant?

I have no idea.

> an hour is enough to lose a satellite.. makes sense? (their period is
> about 12 hours?)

This is just my observation. I have a feeling it may have something to do with the registry key TimeBetweenFixes which is at 1. Not sure what this key actually does, but my guess is that the value specified (whether in hours or days or whatever) is the expiry time for the downloaded data. In other words, the time elapsed in which the GPS will need to reacquire satellite information.

DISCLAIMER: This is just my guess so I could be way off base.

> coordinates 0.0 0.0 ... Atlantic ocean somewhere near Africa?

If it was somewhere near there, I would expect a map with blue (to indicated water) and if I zoomed out far enough, probably see the coast of Africa. However, no amount of zooming out will give me any indication of where I am. Just magnifying glasses with a minus sign in them no matter what I do.

> might it be a coincidence? what's the relation between Google Maps and > Radio? otherwise from your description it seems that AGPS works with
> this radio (though you just said it should not work with Bell phones)?

Yeah, that one got me confused. As a test, I removed the server IP and port in the SUPL AGPS and soft-reset. So now no AGPS is used right? Then I started google maps, searched for my home address which is about 30km away from where I am (at work), selected Use GPS and guess what happened next? IT FOUND MY APPROX. POSITION!!! 1 km away from my work place! I looked at the blue status message on the top right and it said Seeking GPS Satellites (0).... So I've removed the AGPS server, and yet it still found my approx. location.

> btw, do not you know where to get this QPST?

QPST is a commercial app and considered warez and risk possible banning if I say anything more about it so I'll leave it at that.

> so far it is compatible with my obsrervations...

Personally, if my GPS takes more than a minute to get a fix (cold) then AGPS is not working. It should be in the range of 20-30 seconds which is what my N95 can do when I upgraded it's firmware to support AGPS.

[tichi]

> This is just my observation. I have a feeling it may have something to do > with the registry key TimeBetweenFixes which is at 1. Not sure what this > key actually does, but my guess is that the value specified (whether in
> hours or days or whatever) is the expiry time for the downloaded data. In > other words, the time elapsed in which the GPS will need to reacquire
> satellite information.

looks plausible

>> coordinates 0.0 0.0 ... Atlantic ocean somewhere near Africa?
> If it was somewhere near there, I would expect a map with blue (to
> indicated water) and if I zoomed out far enough, probably see the coast > of Africa. However, no amount of zooming out will give me any indication

> Yeah, that one got me confused. As a test, I removed the server IP and > port in the SUPL AGPS and soft-reset. So now no AGPS is used right?
> Then I started google maps, searched for my home address which is
> about 30km away from where I am (at work), selected Use GPS and
> guess what happened next? IT FOUND MY APPROX. POSITION!!! 1 km
> away from my work place! I looked at the blue status message on the top > right and it said Seeking GPS Satellites (0).... So I've removed the AGPS > server, and yet it still found my approx. location.

curious!
my guess is that GoogleMaps is able to retrieve the STORED "last known" location from the GPS chips or wherever, and then it is trying to
center you around this location...
from your story it looks like with the OLDER radio GoogleMaps retrieves this location correctly (or it is simply stored correctly),
while with the newer radio GoogleMaps and radio could not agree on that...
if Google maps gets some garbage as "last known location" from the new radio, and then tries to center you around it, then it explains those confusing screens you get< does not it?

Maybe I should flash the older radio too..
Have you had the older radio from the Alltel rom (as per Tutorial?)
did you install it over the newer one without problems?

> QPST is a commercial app and considered warez and risk possible banning > if I say anything more about it so I'll leave it at that.

thnx I had no idea what is it, that's why asked.. I'll not bother about it then
until I see that it is really needed

[tichi]

> coordinates 0.0 0.0 ... Atlantic ocean somewhere near Africa?

> If it was somewhere near there, I would expect a map with blue (to
> indicated water) and if I zoomed out far enough, probably see the coast > of Africa. However, no amount of zooming out will give me any indication > of where I am. Just magnifying glasses with a minus sign in them no
> matter what I do.


Hey ckl_88, I just tried to experiment with GoogleMaps
it does put you in the (0.0, 0,0) - Guinea Bay - position even with the new radio
(I have the one 3.42.30 or something)..

in order to see it, you shoud enable internet, so that GoogleMaps can download, and also I switched on Satellite View instead of just MAP..

so it seems that there's no difference betweedn new and old radio
wrt this...

P.S.
if it is not too difficult, will you please try a test of Google Maps with the old radio,
in your spare time -
right after SOFT-resetting phone, and resetting google maps (menu, options, reset), and when sats are NOT available,
but internet IS - to osee if it still puts you in the middle of the ocean - (thsi way I think the last known location will be cleared
even wi the older radio).. thnx a lot in advance, I'd like to se if it is indeed useful to downgrade the radio!

[ckl_88]

Originally Posted by tichi

Hey ckl_88, I just tried to experiment with GoogleMaps
it does put you in the (0.0, 0,0) - Guinea Bay - position even with the new radio
(I have the one 3.42.30 or something)..

in order to see it, you shoud enable internet, so that GoogleMaps can download, and also I switched on Satellite View instead of just MAP..

so it seems that there's no difference betweedn new and old radio
wrt this...

P.S.
if it is not too difficult, will you please try a test of Google Maps with the old radio,
in your spare time -
right after SOFT-resetting phone, and resetting google maps (menu, options, reset), and when sats are NOT available,
but internet IS - to osee if it still puts you in the middle of the ocean - (thsi way I think the last known location will be cleared
even wi the older radio).. thnx a lot in advance, I'd like to se if it is indeed useful to downgrade the radio!

Just so you know, my internet is always on because I'm connected via Windows Live push email.

Oh, the other thing is with the old radio (the one I'm using now) it puts me close to my workplace whereas the new radio would put me who knows where.

Okay, so soft reset - done.
Internet On - Yep.
Reset Google Maps - done. Quits the program automatically.
Restart Google Maps. Accept agreement - map of San Fran is displayed.
Clicked Use GPS. Blue status of Seeking GPS Sats (0) is displayed.
wait... here it comes... YES!

puts me about 1km away from where I am (at work). NOT in the middle of the ocean.

So there is a difference between the old and new radio. With the old, it's close to your actual position. With the new, it puts you in the ocean.

But even so, it still takes > 1 minute to get a lock because we don't have any kind of assistance server from Bell to get the ephemeris data to speed up lock times.

EDIT> Strange. While I got the blue dot that's close to my work place, I walked over to the other side of my office, and the blue dot moved to a different location. Now it's about 4km from my actual position.... a different cell tower perhaps.

[tichi]

Originally Posted by ckl_88

Just so you know, my internet is always on because I'm connected via Windows Live push email.

Oh, the other thing is with the old radio (the one I'm using now) it puts me close to my workplace whereas the new radio would put me who knows where.

Okay, so soft reset - done.
Internet On - Yep.
Reset Google Maps - done. Quits the program automatically.
Restart Google Maps. Accept agreement - map of San Fran is displayed.
Clicked Use GPS. Blue status of Seeking GPS Sats (0) is displayed.
wait... here it comes... YES!

puts me about 1km away from where I am (at work). NOT in the middle of the ocean.

So there is a difference between the old and new radio. With the old, it's close to your actual position. With the new, it puts you in the ocean.

But even so, it still takes > 1 minute to get a lock because we don't have any kind of assistance server from Bell to get the ephemeris data to speed up lock times.

EDIT> Strange. While I got the blue dot that's close to my work place, I walked over to the other side of my office, and the blue dot moved to a different location. Now it's about 4km from my actual position.... a different cell tower perhaps.

Thanks a lot!

I just tried to experiment too with the google maps ,
in the same way again (GPS screened, internet /wireless available) and ...
o, surprise, now it locates me too - not precisely, GPS satellites (0), but roughly, to the nearest cell tower (top of a high-rise bulding about 3 km away from my home).

and I.m using the NEW 2.32.40 radio !!

This time I did reset google maps to show me San Francisko first, but
I did NOT soft-reset the phone (an it had many fast locks today )
however, after I do soft-reset the phone, it puts me again in the Guinea Bay

So I guess it is:

- AGPS ("Location service") at work???

(maybe not in the part of that Belgian server, though..
but it has to use SOME AGPS server..
this means that Bell does HAVE one.. hmmm..
how to find out the IP.. the trouble is that
the phone probably does not communicate with it directly, otherwise one could try to use netstat to figure out which one .. or it does?)

- AGPS needs a good guess of the last-known position (which is (0.0,0.0) after a soft-reset - at least in the NEW radio - that is why Guinea Bay shows)

[arianhojat]

wasnt the HTC GPS Tool, have a Clear Memory option, that i heard people run when they goto a new Location or just want to clear satelittes from gps chip so can get faster locks when sat data old/new location.

doesnt help me though. Verizon GPS sucks. sometimes works. sometimes takes forever if i leave the phone by the window. never works when i want it to downtown hehe.
heard running EPST helps other non vz peeps

[divxrippimp]

I have this same issue, usually it will work perfect for a day (after a fresh install/hard reset) then the next day i have issues ALLLLLLLLLLLLLLLLLLLLL day, its super annoying. I dont have this issue with my external gps... Im gonna try some stuff i read in here and see if it helps...

[chrispipe]

TimeBetweenFixes key has nothing to do with Sat data storage. It's the amount of time (in seconds) that the chip updates your location. If you change it to 2, or 5, and use Garmin or GoogleMaps and drive around, you'll see that it updates less often. Saves battery, but makes it very laggy.

That's what it's supposed to do anyways.