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Assisted GPS activated and now???

Hi all,
I am using Navigon6 for navigation but while driving in a tunnel navigon says "you have reached the destination" after the tunnel it starts navigating as usual. I now activated "assisted GPS" with the Kaiser Tweak but now? How does it work now? What do I have to do?
Thanks
Michael

micha2802 said:
Hi all,
I am using Navigon6 for navigation but while driving in a tunnel navigon says "you have reached the destination" after the tunnel it starts navigating as usual. I now activated "assisted GPS" with the Kaiser Tweak but now? How does it work now? What do I have to do?
Thanks
Michael
Click to expand...
Click to collapse
You do nothing! Some people say the tweak works and some don't. It seems to have worked for me. I don't lose signal at this road will lots of trees now (I used to lose signal before I had this tweak applied).

Hi, so I tried the Kaiser with activated A-GPS and Navigon6. As I said I had the problem that Navigon gave the message "Destination reached" while driving through a tunnel. I expected that Navigon, because of a signal from A-GPS, won't bring these message. In the first moment I was happy because the Icon didn't turn to red in a tunnel but then there was the message again. But there is another problem, with activated A-GPS there seems to be some kind of signal (icon doesn't turn red) and because of this Navigon doesn't start routing after the tunnel. So it seems that A-GPS doesn't work together at least with Navigon6. Any ideas?
Cheers
Michael

Hi
I expected that Navigon, because of a signal from A-GPS, won't bring these message.
Click to expand...
Click to collapse
As far as I know A-GPS (QuickGPS on Kaiser) is just for getting initial fix for GPS applications. This helps avoid the initial delay in getting your location, after that it will perform exactly the same.
Regards
Phil

Hi Phil,
OK, I understood what A-GPS does but Navigon should proceed navigation after a tunnel (when GPS signal is back) again even A-GPS is turned on or not?
Cheers
Michael
PhilipL said:
Hi
As far as I know A-GPS (QuickGPS on Kaiser) is just for getting initial fix for GPS applications. This helps avoid the initial delay in getting your location, after that it will perform exactly the same.
Regards
Phil
Click to expand...
Click to collapse

PhilipL said:
Hi
As far as I know A-GPS (QuickGPS on Kaiser) is just for getting initial fix for GPS applications. This helps avoid the initial delay in getting your location, after that it will perform exactly the same.
Regards
Phil
Click to expand...
Click to collapse
QuickGPS is indeed a form of Assisted GPS used to quick the initial fix. However, he is talking about the Assisted GPS tweak for use _while_ navigating. It already requires a fix and lets your phone keep on tracking when going through tunnels or when satellite reception is too low. If it works by simple extrapolating direction and speed or uses some sort of GSM tower triangulation technique nobody seems to know. All we know is that the signal doesn't get lost so quickly with it As always with stuff like that, YMMV.

Are we all sure about the definition of "Assisted GPS" - 'cos QuickGPS is not my understanding of it and neither is extrapolating position using GSM tricks when the GPS signal fails.
As far as I am concerned, Assisted GPS is the term to cover a variety of techniques aimed at improving the accuracy of a fix over and above what is possible from just the received satellite signal. WAAS (EGNOS in Europe) is the most common way of doing this but on a device with a built in data connection there are other options. The basic idea is that a variety of factors including interference to the satellite signals as they come through the ionosphere and GPS satellites being out of adjustment can reduce the accuracy of the calculated location. With Assisted GPS, there are a number of base stations dotted around the world at locations which have been very accurately determined by traditional surveying techniques. GPS receivers at each of these locations are continuously calculating their GPS based locations, comparing them with the known, correct location and generating hints in a defined format which other GPS receivers can use to improve the accuracy of their calculations.
The issue then is how to get these hints out in near real-time to the remote GPS receivers. WAAS and EGNOS use dedicated satellites to transmit them back to earth, but these only cover the US and parts of Europe. With a GPS in a mobile phone, you obviously have the possibility of using the data channel to distribute the correction data - a lot cheaper than launching satellites. The EGNOS correction data is already published on their web site - not sure about WAAS - I tend to assume that enabling Assisted GPS on a Kaiser just sets the receiver to downloading the correction data stream off the internet...
Martin

No, that's not Assisted GPS. That's Differential GPS.
Assisted GPS is designed to allow GPS to perform in areas with poor satellite reception, augmenting the fix with information on nearby cell towers (which have known locations and ranges). Also, in most situations, A-GPS also means that the GPS pseudorange processing is offloaded from the phone to the tower (to allow for E911 on phones with insufficient CPU to calculate a GPS fix on their own), but I'm assuming this part of A-GPS is not coming into play here.

Some users from the pocketnavigation forum have the same Problem with the Kaiser/GPS-Chip. It seems to be a really big software/hardware bug.
By loosing the signal in the tunnel the gps chip stops to send any information to the Navigon-software. That's the problem: The required systemtime for further navigation is missing.
So Navigon tells you: You've reached your destination.
Any Firmwareupdates for this Problem?
Greetings

As far as I understood it, QuickGPS is downloading the satellite almanac from the internet, instead of getting it through the GPS. A GPS which has not been turned on for a while will get this almanac even without internet connection, but it takes about 15 minutes to download it (happens automatically in any GPS unit). Getting it from the internet saves you these 15 minutes, but if you have used your GPS recently for more than a 15 minutes period, QuickGPS should not make any difference.
The almananac for the GPS satellites is like a sun or moon almanac, just for satellites instead. This means that if you have a current almanac, and your GPS knows your rough position, then the almanac will tell the GPS where it should expect to see the satellites. This includes which of the satellites are visible on a given position on the earth (roughly around a third of them), and at what azimuth and elevation. GPS satellites are orbiting the Earth in intervals of just under 12 hours in certain orbits, intercepting the Equator at 55 degree angles (which means that they will cross 55 deg North/South when they are closest to either pole). Since they are more than 20000 km out, this is not a problem if you are actually on or close to either pole, but it means that you will not see satellites right above you at either pole. WAAS satellites are geostationary (which means they can only be somewhere over Equator at about 36000 km orbit), and these satellites do not transmit normal position and time information like the other satellites (SVs) in the GPS system, but precision and integrity information. Put in other words, they tell the GPS receiver 1) Is the signal in your area good or bad and 2) What vector to correct your measured position in whatever area your GPS says you are in. Similar for LAAS units, although they differ in being local area only but on the other hand, more precise. LAAS units are called pseudolites, because they act almost like satellites, though they are really not. For aviation, LAAS enables precision auto-landings in "zero weather" for the same reason, but since the LAAS station is on or close to the surface of the Earth, it only works when in line-of-sight of it.
The problem I am experiencing is if I turn my GPS off and move it a couple of hundred of miles and then turn it on again. This is usually when I am flying, and as we all know, the battery of the Kaiser is not really built for powering the unit for very long! When I turn the GPS on after for intance an hour or so, it still assumes the original position, and it will sometimes get a lock on on or two satellites only, trying desparately to maintain that position. Knowing how the GPS satellites interpolates via a time-shifting technique, I can see why this happens, as it gets a false fix. Aviation grade GPS systems will never lock on to anything less than 3 satellites for a 2D fix, and prefers 5 or 6 satellites minimum for integrity reasons (called RAIM).
What I think is the real problem is that these end user GPS systems for road use have to be more sensitive, so they can be used behind shielded windows and poor reception areas in buildings etc. Trees with many leaves can be an issue also, although clouds are no factor in this equation. Sunspots can blind the system completely if they are strong enough, and that is why eLORAN is an update to the LORAN-C system which is currently being considered for backup purposes mainly.
So, my Kaiser and other end user GPS units will be less restrictive for a good quality fix, and accept second guessing the position, where as aviation and other critical uses of GPS have to have a good position.
We need a GPS utility for the Kaiser GPS to carry out a position reset so it can do a new fix.

Hi guys,
OK I understood what A-GPS is but there is still the issue that Navigon really stops Navigation if the signal is lost when A-GPS is turned on.
If A-GPS is turned of there is also the message "destination reached" but after the tunnel it starts navigating again. Any idea on this?
Cheers
Michael

micha2802 said:
Hi guys,
OK I understood what A-GPS is but there is still the issue that Navigon really stops Navigation if the signal is lost when A-GPS is turned on.
If A-GPS is turned of there is also the message "destination reached" but after the tunnel it starts navigating again. Any idea on this?
Cheers
Michael
Click to expand...
Click to collapse
It sounds more like a bug in Navigon more than anything, check for updates on their site.
A-GPS for Mobile devices as said by some in this thread, extrapolates from the last vector information of the GPS using also information of cell location (in some countries this info is not available due to Gov restrictions) and inserts new data available for any app when signal loss is present from the GPS unit, thus reducing the 'Lost satellite reception' on your app. On WM devices, we are not looking directly at the GPS output but at a 'handler' at com4 able to supply GPS information to more than one app at a time. This is where A-GPS and QuickGPS insert their data when needed. A-GPS just directly inserts nomal NMEA data stream whereas QuickGPS sends the latest Ephemeris data it has downloaded for satellites saving the GPS unit wasting time downloading it from the sats themselves at turn on.
It does seem that Navigon can not resume from the handover back to normal data as other apps can. The fact that it even says 'Destination reached' in a tunnel without A-GPS shows an inherent problem!

Does 3G, HSDPA, Edge each affect the GPS in anyway?

Me and my friend were arguing whether or not theres a difference between searching for satellites on a 3G/HSDPA and an edge connection.
Is it faster or do they have no correlation at all?

3G/HSDPA/Edge is not necessary at all for gps
gps is a 1 way communication between a passive receiver in a device and a geostationary satellite out in space
3G/HSDPA/Edge is a 2 way communication between a device and a ground based transceiver and antenna setup
in theory you can pull out your sim and throw it in a well
and gps still works
but with assisted gps which x1 support one can get a faster pos by the device getting a rough position from the 3G/HSDPA/Edge connection because they know their own location

[Q] could wifi be the problem with samsung captivate's gps issues

anyone else notice that when using the Samsung captivate & navigation that is recommends turning on WiFi. it doesn't make sense, but i notice it makes a huge difference in speeding up satellite connection time with WiFi on.
could this be the issue with the GPS??
please confirm this.
-Alex

This is not a fix. Turning WFi on will help give your phone another source to determine your location. The key thing here is that WiFi cannot determine your location as accurately as GPS can. If you look again, you'll probably see that your phone will "lock" onto your position much faster, but it's probably not going to be accurate enough to be usable.

norcal einstein said:
This is not a fix. Turning WFi on will help give your phone another source to determine your location. The key thing here is that WiFi cannot determine your location as accurately as GPS can. If you look again, you'll probably see that your phone will "lock" onto your position much faster, but it's probably not going to be accurate enough to be usable.
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Click to collapse
you must have read the title before i edited it.
im not using the WiFi as a location source since i don't have any WiFi internet on the road.
but i notice that the GPS locks on quicker than without the Wifi on.
my nexus one never suggest to turn on WiFi when using navigation

Its not necessarily wifi based location but it can use wifi to download gps data. For a date lock. Its just a suggestion, I don't see why out would make a difference with out a wifi signal.
I prefer to not have network location or sensor aiding enabled. Sensor aiding really doesn't work. Made my my tracks results erratic. Network location gets me within 2 miles, not exactly good for navigation, having it on only allow something to fall back on of you lose gps signal but the whole process of the phone switching from one source to the other and back again takes to long. Keeping network location off forces it to only try to get a gps lock and in my opinion works better.
As far as wifi, if you believe it works better that way then do what every you think helps. It really should only download the data and once it has it it is done with wifi un till it needs new data which usually won't be for several hours.
Sent from my SAMSUNG-SGH-I897

GPS Signal reliabilty on LGOB?

Hi all,
what are your long time experiences with GPS reliabilty? I only used GPS with google maps / Navigation a few times and experiences are mixed - on motorway or in the countryside it was fine, but expecially in the city i had trouble with the position being totally off or jumping around ...
So please - is GPS reliable and stable for you? Please report.
Thanks,
Kusie

Yep , same here even when in 3g area and with asosiated wifi networks in range the positioning is bad, never gets under 10 m error.
And once on the road it gets worse good job i use it as a refference only and do not relly on the navigation
For proper navigation i use my Nokia 5800
it beats the P970 even without AGPS on

[Major Bug] Wifi Always Scan breaks Location Services

Hello everyone.
I just wanted to get your attention on a major Android OS (Kitkat) bug in the interaction between Wifi -> Advanced -> Wifi Always Scan and the Location Service. Clearly the bug doesn't happen every time, but sometimes it does, and obviously I'm talking about stock rom / kernel / no root / locked bootloader.
Althought I can't prove it, this might also be the cause of the current GPS / Navigation issues, currently being reported here.
What makes me link this to that issue? Because when Wifi Always Scan bugs out, it prevents my phone to acquire a location even from the 3g network.
That would explain why in that thread many people report that they could navigate with Device Only, which doesn't use 3g or wifi for location, but they had major issues with High Accuracy, which uses all three sources.
Please take a minute to star the issue so that Google will hopefully fix it faster.
https://code.google.com/p/android/issues/detail?id=64597
Thank you,
TD

Just turn it off, all it does is waste battery anyway
Sent from my Nexus 5 using Tapatalk

Ben36 said:
Just turn it off, all it does is waste battery anyway
Sent from my Nexus 5 using Tapatalk
Click to expand...
Click to collapse
Thanks for your useful contribution.
It doesn't waste battery, it saves it. It enables to use the wifi location using a lower power state of the wifi chip compared to actually turned on wifi (which is also more accurate by miles than 3g location, works indoors in clubs where there is no 3g or gps signal, and not as battery expensive as gps location).
Also, people use that option for many things, I for one use it in MANY Tasker tasks flawlessly, whether the alternative (wifi periodic toggle and polling) would rape my battery.

Wifi automatically Turned off. Built in feature?
I kept my wifi on, and the had not used it basically just left the device in the room and had run off.
When I retured, the wifi was on in the power control widget but the wifi signal indicator icon in the notifications bar was absent.
is this normal/intended?
My wifi / internet connection is weak but continuous and my device is about ten to twelve feet away from the modem / router.
Can anybody help?

Although I have not a Nexus 5, my problem seems to be the same. I'll tell you if perhaps serve as any indication.
In my HTC EVO 3D, I've been running since the summer with CM10.2 (Android v4.3.1) with location mode set to "Network & WiFi" and "WiFi Always Scan ON". During this time the location was very accurate, location history left a fairly detailed trace. In Google Maps, was located immediately, as in Google+. If activated the GPS, even better. Summarizing, 0 issues with the location.
On January 1, I decided to upgrade to CM11 (Android v4.4.2), I set my location mode to "Battery Saving" & "Wifi Scan Always ON". During the first 10 days everything was perfect, the location history trail was so detailed as CM10.2 and battery consumption a little better. Google Maps and Google+ also positioned themselves almost immediately. Suddenly, on January 11 the location seems to stop of using WiFi networks and began guided only by the Network Cells (being rather more vague). Also when for some reason failed to position (being out of range of Network Cell), the phone started to not enter Deep Sleep Mode and the battery started to discharge at high speed. Google Maps, Google+, 1Weather ... were unable to obtain the current location or showed the last known location of hours before. Rebooting the phone sometimes temporarily solved the problem, but sometimes not.
I tried to change the placement options; abroad, with "high accuracy" mode, the location worked well, but indoors the GPS was not able to find satellites (logical) and still the same problems. I enabled and I disabled the location, nothing. Factory reset, no change.
To rule out a hardware failure, I returned CM10.2. Everything about the location worked smoothly... Return to CM11, again the same problems.
In short, my impression is that this is a software bug, as in versions prior to v4.4 Android location "Network & WiFi" + "Scan Always ON WiFi" works correctly. Moreover, not only occurs in the Nexus 5.
I have marked with a star your ticket.
I'll keept testing.

I get this problem when I use tether with WiFi always scan enabled.
When I disabled tethering, I have to manually enable WiFi to fix the location reporting issue.
With WiFi scanning not enabled, I do not get this problem
Sent from my Nexus 5 using XDA Premium 4 mobile app

I think I have similar problem and I really hope smbody can help me.
On my stock nexus 5(4.4.2) wifi location don't work in google maps and ingress, when I turn it on instead of gps location.
But in other apps wifi location works( yandex.maps, 4square)
Only reboot helps

Hello again.
I just updated Google Maps to version 7.6.0 and Google Play Services to version 4.2.39 and all the problems I had with the location are gone, everything is okay again, as it did in CM10.2. So it looks like it is confirmed that it was a software bug.

Sorry, I know this post is quite stale, but I came across it doing a search about this very same problem I've seen on my LG G4 (stock). I have a Tasker task that uses WiFi near state and I use the "Allow Wifi scanning..." option in my Advanced WiFi settings. Whenever I would use WiFi tethering and then later turn it off, I noticed my Tasker task would not detect the WiFi networks it was supposed to. If I turn the "Allow scanning" option of and back on, or just turn on WiFi altogether, it starts working again.
So, after more than a year and a half, and on a newer version of Android and it still doesn't work right. Who knows; maybe it's a Tasker problem.
-SR-