ones and for all! GPS problem with MTK6589T devices! - Hardware Hacking General

hi all
as i can see, only MTK6589T devices has a bad GPS SNR values.
THL W8S (the W8 works fine), Jiayu G4, NEO N003, and more...
the CPU is the same CPU but with overclock frequency.
so i think that it is a kernel issue. there are no new kernel, so hear your solutions for a GPS antenna mod that gives more than 40 SNR. (less than 40 SNR will result in low accuracy in WAZE and GOOGLE MAPS)
thanks

Jiayu G3T
Hi,
I have the same problem with Jiayu G3T,
what is GPS antenna mod, where can I find it?
thanks
chenrp said:
hi all
as i can see, only MTK6589T devices has a bad GPS SNR values.
THL W8S (the W8 works fine), Jiayu G4, NEO N003, and more...
the CPU is the same CPU but with overclock frequency.
so i think that it is a kernel issue. there are no new kernel, so hear your solutions for a GPS antenna mod that gives more than 40 SNR. (less than 40 SNR will result in low accuracy in WAZE and GOOGLE MAPS)
thanks
Click to expand...
Click to collapse

still, we can overcome the kernel problem like so:
http://forum.xda-developers.com/showthread.php?t=2421671&page=5

Related

GPS reciever with the magician

Hi,
does anybody have any recommendations abt bluetooth gps reciever?
Example: http://www.oncoursenavigator.com/item.aspx?itemid=6009
What is important to think abt when you buy a GPS reciever?
Royaltek RBT-2010...
SirfIII, 17 hrs battery, small, light and cheap.... marvellous!
A week with it and I'm still astonished about the skills of this GPS.
Look for reviews of it and check it!
Thanks for the tip!
Googled but only got results in: spanish, italian, russian or german sites!!! Don´t know any of these languages.
My guess is that it´s called something else in other countries. Anyone knows?
I've got one like this Oasis Media Bluetooth GPS Receiver: € 79,-
www.pdashop.nl probably in others shop as well
M
I can recommend the Holux GPSlim 236. It lasts about 10 hours, is small, light and very good at acquiring and keeping a signal (it's SirfStar III).
Generally you should go for a SirfStar III these days, especially if you want to use it in cities with tall buildings or out hiking in woods.
There is one slight problem with them however. For car mode you should really engage static navigation mode (this prevents the map rotating or recalculating when you are travellig very slowly or stopped). But for hiking and geocaching you really need to have static navigation turned off. There is a windows app that can switch it on or off but I've found that the pda app to do the same doesn't seem to work on my setup. I therefore use mine with static navigation turned off and get the occasional recalculation and map spins.
Thanks for your reply!
Are there differences between recievers considering static navigation mode? What I mean is if it´s in the software you do the setting or if you change directly at the reciever unit?
Been looking at this one;
http://www.dustin.se/DustinPictures/PDF/G/5010079858.pdf
Nice one, how about the price?
In Sweden the best price is abt 125 euro. Plus delivery costs.
Hmm,
That's about the same price I paid 8 months ago for my GPS, simular to the Oasis one I posted. A collegue of me bought a SirfStar III GPS 2 months ago for around €160, you're deal is much better (depending on the shipping costs). We tested both devices & his device got a lock on more satellites & quicker as well.
So it's up to you whether you want to pay twice the price for the better GPS. Usually my GPS works fine even in cities, but I guess a SirfStar III chipset will be much more capable with tall buildings. I'd go for a SirfStar III chipset, when I had to buy one now & knowing my own experiences.
Regards, M
emil73 said:
Thanks for your reply!
Are there differences between recievers considering static navigation mode? What I mean is if it´s in the software you do the setting or if you change directly at the reciever unit?
Been looking at this one;
http://www.dustin.se/DustinPictures/PDF/G/5010079858.pdf
Click to expand...
Click to collapse
Some manufacturers of SirfStar III GPS may provide their own software for switching between modes - but they may not. The software I use on the PC is provided by someone at SirfStar I think. As I said it works fine on the PC but obviously you really need it on your pocketPC. So far I haven't found any software that will change modes on the pocketPC - I have software but it doesn't seem to work. Maybe someone here can suggest pocketPC software for switching modes?
At the moment I leave mine with static navigation off and it doesn't have too much of an effect on car navigation where I drive.
The PC software seems to allow you to also alter the signal strength at which a satellite's data is disregarded. Upping this a little may help with the problem at the slight disadvantage of making the receiver a little less sensitive. I think you could lower it a reasonable amount and still have a sensitive receiver - mine works fine in the glovebox and I can get a fix in the middle of my house - that's how sensitive they are!
Look on manufacter page http://www.royaltek.com/content/view/97/27/
about the Royaltek. It's in english (or Chinesse :lol: ) and you can search there for a distributor in Sweden.
Good luck!

gps settings

ei mates
apologies if this has been posted before. i was wondering what gps settings you guys use which in your opinion optimizes the gps application. i did read that comport 4 is normally used for the programs. may i ask what you guys use for the hardware? i noticed that setting comport 4 for BOTH software and hardware takes absolutely ages to get sat fixes. at the moment i'm using comport 4 for the programs and comport 5 for the hardware. anyone with better settings? and what's the baud rate that you use?
thanks and cheers
Hi there,...
I am not sure what you exactly requesting, but I am playing with the standard settings of WM6 and have a fix within 30 sek (maybe a little more sometimes).
This means:
GPS programmport = 4
GPS hardwareport = *not set* / baud 4800
By the way... this with the Radio Rom 1.50 !!! Think this also might be important. If you use older ROM you should this about flashing Radio maybe!
Find according ROMs here : http://forum.xda-developers.com/showthread.php?t=319993
Due to ActiveSync within every 2 days quickGPS is always up to date (mmh,.. ok most of time let me say)
Example using TT 6.030
Getting into car... activate TT (and GPS with it) and setting the target location.
Then I mount this Ameo in the car holder... this approx takes over all 30-60 sek. after this time TT has the fix, I can start navigation and startup.
Ofter heard about problems with the GPS, but I can not confirm.
Not exactly what you like to know, but maybe my experience is a little useful.
The problem could also be, that the chipset is not the Sirfstar one. So it could have some difficulties with connection in forests, among tall buildings etc...
thanks for the response. on what i'm after is the settings you put in your gps. i didn't upgrade my unit to wm6 nor do i have plans of doing so. with that i still use comport 4 for the programs and so far comport 5 seems to be give me around 30-45 seconds to get a sat fix. i was wondering if there are other comport settings for the hardware (coupled with the baud rate) that the others use...and works well with them.
thanks!

Touch HD same GPS lag as Touch Pro?

Just wondering if the Touch HD will get the same laging GPS receiver the Touch Pro and Diamond got? I sure hope not. Its the only thing that dissapoints me with my Touch Pro.
utvol06 said:
Just wondering if the Touch HD will get the same laging GPS receiver the Touch Pro and Diamond got? I sure hope not. Its the only thing that dissapoints me with my Touch Pro.
Click to expand...
Click to collapse
It's not an issue of hardware, but software. That's like asking if it will have the same laggy TouchFlo3D because of its processor... It's just the software. My Fuze didn't have any of the complaints of slow TF3D or GPS lag, but it had the same GPS receiver as the European Touch Pro.
Black93300ZX said:
It's not an issue of hardware, but software. That's like asking if it will have the same laggy TouchFlo3D because of its processor... It's just the software. My Fuze didn't have any of the complaints of slow TF3D or GPS lag, but it had the same GPS receiver as the European Touch Pro.
Click to expand...
Click to collapse
I think the cause is the hardware, because some people tried with an external gps antenna, sirf3, and no lag at all. And changing software doesn't eliminate the lag. I use iGo and TT and the lag is always there...
onesolo said:
I think the cause is the hardware, because some people tried with an external gps antenna, sirf3, and no lag at all. And changing software doesn't eliminate the lag. I use iGo and TT and the lag is always there...
Click to expand...
Click to collapse
Hopefully HTC will be able to fix the GPS Lag in the diamond and Pro with a rom update...they are supposed to be working on it. I just hope the Touch HD wont share the same lag problem and that HTC sees that it doesn't before release.
Isn't the difference between the built-in GPS and an external GPS antenna the method? The built-in GPS is (AGPS) and an GPS antenna uses "normal" GPS....
No, that's not it.
Assisted GPS is something extra for a normal GPS system, not a different system. A basic GPS system will have to download the satellites' position each time it cold-starts, and that will take time. An A-GPS system will have an additional way to download the current position of all GPS satellites, in order to speed up the process, by knowing the position of your phone in a GSM network or by downloading an updated file containing the satellites' current position, through a data network (wifi or 3g). That's why the "gps assistance" files you download through this kind of assistance application (in HTC's case, it's called "Quick GPS") are only valid for 2-3 days: in 2-3 days, they expire and the satellites' positions aren't valid anymore.
All GPS systems must have an antenna of some kind, either internal or external. Mostly all PDAs with integrated GPS have an internal antenna, which does the job in most conditions, but it's not perfect. I used an external antenna for car navigation, and in most situations I went from 4-5 detected satellites (with so-so signal) to 7-8 with full signal, only by having an antenna on the roof of my car. However, this shouldn't influence by all means the GPS lag, only the precision of GPS positioning on the map (coordinates).
That's not it either.
Quick GPS downloads a file prior to GPS initiation. When started the GPS works off-line.
A-GPS is a hybrid technology that auguments the GSM satellite signal with GSM signal on-line.
You can use Quick GPS without A-GPS, which is the case of most users today, for compatibility reasons.
As for the previous question regarding GPS lag, here are two points (depending on what you understand by GPS lag):
1. the GPS chipset has a built-in refresh rate, which should be something like 0.5 seconds. This is the same for all devices sharing the same chipset.
2. when saying that the GPS performance depends on software, it does not mean IGO or TomTom, it means the Radio drivers. Newer Radio versions come up from time to time and may improve GSM / GPS signal strength or battery life, and in the very best cases both.
Follow the ROM Development threads for more info.
dani31 said:
That's not it either.
A-GPS is a hybrid technology that auguments the GSM satellite signal with GSM signal on-line.
You can use Quick GPS without A-GPS, which is the case of most users today, for compatibility reasons.
Click to expand...
Click to collapse
Not to be a GPS-nazi but A-GPS doesn't necessarily imply the usage of a GSM network, but the usage of an assistance server. From Assisted GPS page on Wikipedia:
A typical A-GPS-enabled cell phone will use an internet connection to contact the assistance server. Alternatively, it may use standard non-assisted GPS, which is slower and less accurate, but does not lead to network charges for data traffic, which can be considerable.
Click to expand...
Click to collapse
So, it can be done either through GSM networks, or through a data connection; therefore, the Quick GPS app is simply another form of A-GPS.
dani31 said:
1. the GPS chipset has a built-in refresh rate, which should be something like 0.5 seconds. This is the same for all devices sharing the same chipset.
Click to expand...
Click to collapse
That I don't think would be visible to the end user. According to the NMEA/SiRF specs, the min refresh rate would be 1 Hz (one time per second), but the average among devices seems to be around 5 times a second, once every 200 miliseconds (5 Hz refresh). The GPS chip should do that without a problem (according to the manufacturer's specs), therefore the problem must be somewhere after the GPS data is sent to the device; either in communication to the CPU, either in the navi software. My 2 cents. We'll see.
Review from SlashGear
HTC Touch HD's review by SlashGear talks about the GPS lag..
this is the part about GPS performance of the Device:
"The HTC Touch Diamond has been criticised for its GPS performance, which can lag behind actual position when moving at speed. Hopes were high for the Touch HD to avoid such a fate, but unfortunately that doesn’t appear to be the case. Whether from the processor (the same 528MHz Qualcomm MSM7201A as in the Diamond) or the GPS receiver itself, when driving the indicated position is always 50-80ft behind. This makes navigating via the on-screen directions incredibly difficult. At lower speeds, such as when walking, the Touch HD has no problems, just like the Diamond. We’re still attempting to get hold of some alternative GPS programs, such as TomTom or Garmin Mobile XT, and will update this review when we’ve had an opportunity to try them out."
has anyone else bought the Touch HD yet who can confirm this?
i just hope the GPS lag isn't as bad as the HTC Touch Diamond/Touch Pro as i'm going to order one pretty soon.
For the sake of millions of readers and potential touch HD buyers like me,can someone who already own a touch HD,please be kind enough,do an experiment about this gps lag issue and give an absolute answer to this issue.Gps lag is very noticeble when you are navigating at high speed(eg:80-100km/h) or when doing multiple rapid turns(eg:driving on back alleys).at low speed(slow drive or walking),no lag is apparent.Currently i'm using ipaq 612c where it has this lag issue and its most noticeble when using Garmin XT.When using mapking or tom tom it is not that bad..Really waiting for all your answers.
Thanks in advance for all your help
iznee said:
For the sake of millions of readers and potential touch HD buyers like me,can someone who already own a touch HD,please be kind enough,do an experiment about this gps lag issue and give an absolute answer to this issue.Gps lag is very noticeble when you are navigating at high speed(eg:80-100km/h) or when doing multiple rapid turns(eg:driving on back alleys).at low speed(slow drive or walking),no lag is apparent.Currently i'm using ipaq 612c where it has this lag issue and its most noticeble when using Garmin XT.When using mapking or tom tom it is not that bad..Really waiting for all your answers.
Thanks in advance for all your help
Click to expand...
Click to collapse
Ok, I have performed an experiment. Hopefully it will help you and "millions" of readers to decide if GPS lag is a problem or not on this device.
Test setup:
PDA 1: Mitac Mio A701, GPS chip: SIRF III, navigation software: IGO8
PDA 2: HTC Touch HD, GPS chip: Qualcomm, navigation software: IGO8
Experiment:
I start IGO8 on both devices and select the same destination. They both pick up GPS signal and the show starts..
Result:
PDA 1: depending on your speed, there is a GPS lag. This is between 0-2 seconds. In distance I would say about 20 to 50 meters. Again, all depending on your speed. When you stop (which unfortunatelly happens a lot in the netherlands due to high traffic ) the GPS gives the right position.
PDA 2: see PDA 1. There is practically no difference. Sometimes PDA 1 is more ahead, sometimes PDA 2 wins. The voice commands start virtually at the same time "take a turn left", "leave the highway" and so on. Maybe PDA 2 is a bit faster (less GPS lag) since I heard the voice like a 10th of a second earlier than on PDA 1.
Conclusion:
GPS lag is a problem that practically all "cheap" GPS devices have, specially in a moving vehicle. Since your GPS data is refreshed every second, you would be one second off every time. Moving at 100km/h, that means an offset of 27 meters. Moving at 150km/h that is about 41 meters (and yes, I know I should not drive that fast in the netherlands ). Add to that the GPS errors and you will get an impression on how hard it can be to predict where you will be in a second.
You could then say that the navigational software should take that into account and predict where it would be, but that also has a negative side. Have you noticed what happens when you do not follow the course laid ahead by the navigational software? it stays on course for a couple of seconds and then it notices you actually turned left or right, thus the direction should change.
The more aggresive the prediction is, the more you will have a problem when deviating. The less prediction, the more GPS lag you will have.
Is this a problem while driving? I have never considered it a problem. On the highway you do not decide to take a turn within 50 meters (I hope ). In the city, you should have way less problems with GPS lag...
Last, for all the "millions" of readers, please read these two articles:
Article 1, an abstract about navigational state estimator
Article 2, a forum discussing this very problem in the i-Blue receiver. Pay special attention to the answers given by JakeRich
I hope this helps you all out...
David,
I am so very pleased you had these two devices with the software mentioned.
It just so happens that I too have a Mio A701 with iGo and my next purchase will be the Touch HD.
Your test served as a good starting block for me to build upon.
I did wonder how well the Touch HD would fare against my A701.
Many thanks.
Beards
Thanks for your test. What about TMC info with iGo8 ?
gergy said:
Thanks for your test. What about TMC info with iGo8 ?
Click to expand...
Click to collapse
The device finds the TMC receiver (using 8.0.x version, 8.3.x version does not find anything) but then it does not find a channel. This would need a TMC expert to work out...maybe you need to change something in the sys.txt file of IGO8
Something I would add is that until last week I was using a SirfStarIII equipped BT GPS receiver linked to my Hermes and running TTN 6.03, now I'm using the Touch HD internal GPS and TTN 7.45. I have found that the GPS signal appears to be significantly weaker on the Touch TD. However, it does have the capability to pick up more satellites it seems.
In my standard journey between home and work the BT GPS receiver never picked up more than 8 satellites but never picked up less than 4 and spent most time tracking 5-6. The Touch HD at times picks up 10, maybe even 11(!), satellites but often drops to 2 and spends most time tracking 3-5.
Impression
I'm using Tomtom 7,451 now on my HD.
I tried it with the internal GPs and even with an external bleutoth GPS receiver from Tomtom itself.
The so called lag is the same in both cases.It is caused by the slow refreshing rate ( almost 1 second ).That is not a major problem and is the same that I experienced already with the Polaris,Cruise and Diamond.
So when driving try to think at least 1 second ahead.
When you're not moving I got a pefect lock on my position with Tomtom but with Googlemaps i'm of by almost 150 meter to the East.
So that's software I think.
BerreZ said:
I'm using Tomtom 7,451 now on my HD.
I tried it with the internal GPs and even with an external bleutoth GPS receiver from Tomtom itself.
The so called lag is the same in both cases.It is caused by the slow refreshing rate ( almost 1 second ).That is not a major problem and is the same that I experienced already with the Polaris,Cruise and Diamond.
So when driving try to think at least 1 second ahead.
When you're not moving I got a pefect lock on my position with Tomtom but with Googlemaps i'm of by almost 150 meter to the East.
So that's software I think.
Click to expand...
Click to collapse
I get my touch hd today. looks like I wont be installing Google maps at all on it. I'm going to buy Co-Pilot 7 when I get the chance. I also like Windows Live search GPS app, but it may lag like google.
utvol06 said:
I get my touch hd today. looks like I wont be installing Google maps at all on it. I'm going to buy Co-Pilot 7 when I get the chance. I also like Windows Live search GPS app, but it may lag like google.
Click to expand...
Click to collapse
Google maps is already preinstalled, at least on my Touch HD it was (Netherlands)
last word on gpslag?
Hi to All,
Personally, i start realizing the limitation of forums in producing real information.
First of all, most "commercial" and consumer GPS update their position every second, as correctly pointed out in this forum. Said this, faster position updates are possible for professional devices, see
http://www.dsprelated.com/showmessage/22833/1.php
but we can probably forget about it for the time being.
so, don't be surprised if - driving at 100 km per hour alias 30 m/s - you will miss the exit by 30 meters. Be reassured: Felipe Massa will miss the box by 100m if he would drive by looking to the GPS - and your braking distance was anyway 60 m....aaaghh....i hope i will never meet any of you while making the test.
My firm and conclusive opinion after extensive evaluation with Igo and Tomtom and gwatch:
The GPS LAG on the touch HD is a metropolitan legend invented by i-members!
If you check on igo8, there is a small dot representing the actual position, and the arrow or the car is the position compute by software interpolation/filtering etc. Everybody can notice that the dot moves instantaneously. It is a matter of software to decide how to filter this data, and how "reactive" you want the position change to happen. On top of this, it is obvious that updating a VGA or WVGA screen will be heavier than updating a small screen, so there should be a lag which is dependent on the navigation software you use and on the load on your telephone.
However, there is definitely no lag on tomtom....the problem is: how to buy version 7?
Here is video comparison omnia vs hd
It seems to me there is little lag on hd.
Colud somebody translate it?
http://www.youtube.com/watch?v=v45--rkRgjk

GPS (Touch Pro) vs GPS (Xperia)

Do somebody know if there is any difference (in practical terms) in GPS implementation in both devices.
I've heard (unconfirmed) that Xperia could not use its GPS module without access to gsm network (it is capable only of aGPS) while Touch Pro could do both (aGPS as well as stand alone GPS).
Please let us know.
Thanx.
I haven't tested neither of them so I can't tell you about that, but what I can say is that the rumour you´ve heard (about only accessed to gsm network) is NOT true. aGPS is just like an ordinary GPS but with the assistance of the "a" (the gsm network) when and if available.
GPS
It makes sense. Thank you.
The Xperia has both network assisted gps and regular gps
the gps is in the qualcomm cpu same brand on both devices as i'm not wrong
Since both Pro and X1 use the same chipset for GPS, has anyone, who owned both, noticed any differences(or similarities) in the performance of X1?
Did someone test the fomous GPS lag issue in X1?
I have had a very positive experience with the xperia's gps.Outdoors (inside cars ofc) I can get a fresh gps fix within second. Indoors I usually get it in less than 2min but that prob depends on the building
cheers
Hi.
But what about the GPS lag issue of touch pro and Diamond?, you know, when you move (by car) and you stop then the arrow reaches you after some seconds (instead of stop in the moment), this is, the arrow is always 20m-60m behind you.
I can confirm that there is about one second of lag with the GPS while driving with a constant speed of ~80 km/h. Tested with the latest TomTom. This equates to about 20 m. I have yet to see a GPS receiver that doesnt have any lag though...
Thanks. Thats what I wanted to know
danielherrero said:
Thanks. Thats what I wanted to know
Click to expand...
Click to collapse
But have you seen any GPS that DOESN'T lag?
I am curious because the few I have seen, internal and external do lag also. I figure GPS by its nature HAS to lag, its the time it takes to get a signal off several satellites and triangulate your position from them.
Hi Alex.
Take a look to the diamod,s forum and touch pro forum and you will see what I am talking about. There are hundred of forum pages talking about it (in xda). I ve used gps devices since 10 years ago. With my latest devices (kaise, cruise) there wasnt that issue. But GPS lag in diamond make very hard to drive in a city. When theorically diamond shows you re in a cross really you are 50 meters passed and I loose many turns. Many people, me included, ve contacted with htc to report the issue and they say their people is trying to fix the problem.
Dani
Ah so "Its lag Jim but not as we know it!".
Fair enough, I hope the X1 doesn't suffer then but I have an external GPS for my Wizard anyway if it did.
hehe,
I ve an external gps bt too but I want to use the internal one. I am very sad about the diamond gps lag problem and I am going to sell it and buy a x1 if, and only if, gps lag isnt a problem with x1
ps: GPS performance is very important to me, did you notice it?
danielherrero said:
hehe,
I ve an external gps bt too but I want to use the internal one. I am very sad about the diamond gps lag problem and I am going to sell it and buy a x1 if, and only if, gps lag isnt a problem with x1
ps: GPS performance is very important to me, did you notice it?
Click to expand...
Click to collapse
Of course, you're batman after all
Can't have you running into walls with the batmobile.
Well at least if you run into walls with the batmobile, the car isn't harmed.
Besides, if you followed GPS literally you would be driving on the sidewalk and through trees - at least according to Google Maps anyway.
That last few couple of meters of inaccuracy can be a real pain
Exactly!!. My bat-car hasnt windows to protect me against guns and rockets so I need to rely in the gps at 100%
By the way what gps software do you think is best for the Xperia ?
Alex Atkin UK said:
Well at least if you run into walls with the batmobile, the car isn't harmed.
Besides, if you followed GPS literally you would be driving on the sidewalk and through trees - at least according to Google Maps anyway.
That last few couple of meters of inaccuracy can be a real pain
Click to expand...
Click to collapse
Well, at least you have an excuse!
"Officer, the GPS told me so, fine it! No, i'm not drunk. What's with the taser..."

TomTom 7 is always about 200 meters behind my actual position

Hi there,
i am running tt7 on my Asus P535 with WM 6.
I have this problem:
TomTom is always about 200 meters behind my actual position. I think this is so because of an not well resolution. Only if I drive very slow (about 30 km/h) tomtom shows my position correct.
I tried all versions. Repack 3 qvga, qvga... 7.450,.. 7.541...but each version came up with the same result.
Is there a possibility to stop this annoying lag ? Or do I have to cope with it. Did anyone else notice this , also?
With TT 6 (6.032) this problem never appeared.
If you're using a bluetooth reciever it sounds like it hasn't got many channels. More channels better reception - more accurate.
If the phone has gps built in then check the position of the phone in the car. It needs a clear signal to work properly. under the windscreen is best, not on the seat beside you.
Otherwise it sounds like memory problem. Other apps using ram and limiting how much the gps program can use. though most of the time when I had that problem it just kept jumping all over the place.
You have to slow down, you're driving too fast
You can also try turning off points of interest and any info you don't need. Even street names can make it laggy.
uran235 said:
Hi there,
i am running tt7 on my Asus P535 with WM 6.
I have this problem:
TomTom is always about 200 meters behind my actual position. I think this is so because of an not well resolution. Only if I drive very slow (about 30 km/h) tomtom shows my position correct.
I tried all versions. Repack 3 qvga, qvga... 7.450,.. 7.541...but each version came up with the same result.
Is there a possibility to stop this annoying lag ? Or do I have to cope with it. Did anyone else notice this , also?
With TT 6 (6.032) this problem never appeared.
Click to expand...
Click to collapse
I don't think it's Tomtom's versions problem... it's the GPS signals likely
If you don't get a good signals or number of Sats yo will be far from your real position.
Consider if there are alot of obstacles which would cause or interfere with the signals:
- Tall buidlings, trees, objects
- under ground car park, buidling
- Metals (depends)
- Raining and not clear sky
- Other devices or in a high EM
- GPS chips got faulty
- Firmware or memory that store calculate functions got problem
- Not enough numbers of Sats
- ...
Hi again,
I don't think it is an GPS Problem.
I have an built-in- GPS- Receiver and I get between 6-11 Satellites.
Another user (he has the Diamond) had this problem, also. But he took the wrong tt7- Version. After using the right one everything was okay.
But it also might be the processor of my P535 ? Might that also be possible?
oh, I got about 18- 20 MB of RAM free
uran235 said:
Hi again,
I don't think it is an GPS Problem.
I have an built-in- GPS- Receiver and I get between 6-11 Satellites.
Another user (he has the Diamond) had this problem, also. But he took the wrong tt7- Version. After using the right one everything was okay.
But it also might be the processor of my P535 ? Might that also be possible?
oh, I got about 18- 20 MB of RAM free
Click to expand...
Click to collapse
Have you tried using iGo or other GPS apps and experienced similar lag ?
Even on my old Wizard TomTom7 runs without problems.
Have you tried it in another car, or outside your car? Maybe your front window has a special alloy to prevent sun emission. Know this problem of some of my friends, they have had this problem (Mostly on new VW,Audi,BMW i know this problem, maybe other cras have something similar).
Hello,
I tried many other GPS-Systems. Navigon, IGO, MIO,Garmin, tt 6. But this 100-200 m lag appears only with tt 7. And this was all in the same car.
I have no ideas anymore what this might cause this.
I know, my P 535 is not the latest one but it still has got a 520MHz Intel Xscale..
It is not the map, also. I tried 3 different tt 7 maps already..
uran235 said:
Hello,
I tried many other GPS-Systems. Navigon, IGO, MIO,Garmin, tt 6. But this 100-200 m lag appears only with tt 7. And this was all in the same car.
I have no ideas anymore what this might cause this.
I know, my P 535 is not the latest one but it still has got a 520MHz Intel Xscale..
It is not the map, also. I tried 3 different tt 7 maps already..
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I dont think changing car will make any difference . I used tt7 on p535 without any problem at all. but i like igo or garmin more
Do you have other GPS software like CheckPoint 3.0 ? Because Checkpoint failed to run correctly with my TomTom7 and Cruise.
Hello
I have the same problem with my nex Tomtom V7. i've got a Samsung Omnia
First I try it in walk, and my position is not correct
I try many times in a car and my position is not as exact than Tomtom V6
Well, weirred.
Maybe it is the ROM then.
I am still using WM 6 [CE OS 5.2.1236 (Build 17741.0.2.1) and not "WM6.1_20748.1.4.0" ROM.
Another user just jold me that with his PPC (ASUS 636N) the same error occured.
uran235 said:
Well, weirred.
Maybe it is the ROM then.
I am still using WM 6 [CE OS 5.2.1236 (Build 17741.0.2.1) and not "WM6.1_20748.1.4.0" ROM.
Another user just jold me that with his PPC (ASUS 636N) the same error occured.
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As was mentioned above by snachez, I believe it's the amount of poi's you have showing on the screen while driving. I had the same problem with about 20 poi's showing. When I turned it down to about 4 poi's, the problem went away, and now it's SMOOTH as silk.
Hope this helps!
Sorry to chip in here. Seems like you all here uses GPS. I just bought a new PDA. MWg Zinc II with built in GPS. As I am living in Singapore, I would like to know is it possible to obtain igo Singapore map for free? GPS maps are very expensive and I would like to know where can I download it and use it as a full version without paying.

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