[Q] Once again on the GPS... Crap after JVP - HELP?

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So here's the deal, and sorry for posting again on GPS matters... Thing is, my GPS was really good on Juwe's 5.0 JVP with Semaphore.

(Before this I did the usual stuff - GPS bend-the-contact hardware fix, GPS aids, calibrate the compass, even Nexus S binaries - I got really good navigation with JVP)

But now, after JVQ and JVR, it's completely shot to hell. I went through many ROMs with different kernels, but it just doesn't maintain a lock, and when it does (for like 4 seconds...) it's usually with 30 m accuracy ( -> useless).

What's weird is that I usually get 5+ birds, with SNR over 28, usually around 35!!

I'm on Jetpack 3.1 with Semaphore 1.5.0, OCed to 1200 MHz, and UVed ( - really stable and fast, no FC, no reboots).

Can anyone offer some insight? Should I just go back to JVP?

Thanks

Sorry to hear this bud - I'm having the same problems and did same stuff - i.e. hardware "fix" and tried many roms. So many in fact that I have no clue as to what "helped" and what was just pot luck.

GPS on this phone is undoubtedly broken and widely documented as such. I even bought an SGS II and sent that back because of similar problems. Samsung don't give a rat's ass about this issue and it will get "fixed" in their future phones by mere coincidence (they get a decent chipset and/or decent programmer to write quality drivers) rather than any effort on their part. HTC manage outstanding GPS on all their phones in comparison to Samsung. Shame HTC don't do Super AMOLED.

Originally Posted by Plantaman

So here's the deal, and sorry for posting again on GPS matters... Thing is, my GPS was really good on Juwe's 5.0 JVP with Semaphore.

(Before this I did the usual stuff - GPS bend-the-contact hardware fix, GPS aids, calibrate the compass, even Nexus S binaries - I got really good navigation with JVP)

But now, after JVQ and JVR, it's completely shot to hell. I went through many ROMs with different kernels, but it just doesn't maintain a lock, and when it does (for like 4 seconds...) it's usually with 30 m accuracy ( -> useless).

What's weird is that I usually get 5+ birds, with SNR over 28, usually around 35!!

I'm on Jetpack 3.1 with Semaphore 1.5.0, OCed to 1200 MHz, and UVed ( - really stable and fast, no FC, no reboots).

Can anyone offer some insight? Should I just go back to JVP?

Thanks

When I was on samsung roms I found that the GPS in JVP/Q/R was a lot worse than froyo. It only started maintaining the lock during drives when i used hardcore's T22 kernel with KC1 modem (for the 850 band in Canada).

Maybe try a different modem. I've heard that JV1 modem is better for GPS than JVQ, JVR modem. Just flash via ODIN.

Try GPS Status on the Market. There you can download GPS Assistance data...
Calibrate your compass with it and, the thing i've done:

Goto into /root/etc and edit your GPS.conf file to your actual position in this world.

Mine is europe.pool.ntp.org

Sent from my GT-I9000 using XDA Premium App

- the modem has slight impact of gps performance - have not noticed diff betwen jve(jv1) and jvr

- the gps.conf tweaks does not affect gps much

- the firmware itself contains some files that boos significantly gps performance (snr, ttff, birds count) those are few files here and there on system that all together makes gps working ok. that is the case in jvp jvq and jvr - still gps likes to travel own way sometimes (google navigation tested and other apps like my tracks)

DO NOT USE ANY OF THOSE WONDER/PAID APPS FROM MARKET - MORE OR LESS A SCAM TO MAKE YOU PAY THE MONEY FOR APP

if you have problems with gps on jvp/jvq/jvr that means:
- your theme/rom maker screwed up those importnt files
- your firmware instalation is not correct
- you have some hardware issue -> use warranty to replace faulty unit

this is how gps behaves not even under clear sky but at window
http://forum.xda-developers.com/show...&postcount=436

@The BigX: thanks, been doing that since Éclair

@$omator: I always try to flash ROMs and kernels properly (flash stock first, etc), and all the Roms I've been using have been pretty flawless in everything else but the GPS... Thing is, in GPS Status or GPS Test I get pretty good locks, even when driving (SNR over 30 for most of them, even 10 m accuracy).

It just seems like... Google Maps or Navigation don't access the same data or something, and it takes forever for a ****ty lock that lasts 4 seconds and is accurate to 50 m.

Gonna try Aura tomorrow.

Thanks for the help, guys.

was using google navigation as a car navigation, phone 'was' on front windscreen

lock was fast and more or less acurate - with problems on roads with woods around (that was very lol when i enetered the forest fix was going from 5 to 50 meters) - but 99% of time stayed on the road wo problems

it is well known problem with the chip used in sgs1 - same one is used by various devices like apple and htc ones with same ****ty results on all - so most likley the chip is just crap=)