- I'm using the mapdroid google app for offline gps. I find that my location is off by 100 meters. Anyone know how to calibrate or make the gps more accurate ? Is it possible that my gps on the Playbook is defective ? (I do not have 3G or wifi available when I'm in my car.)12-11-11 05:48 PMLike 0
- I have posted about gps on a couple of other threads. I don't believe your PB gps is defective. More than likely you could not acquire enought satelites to get greater accuracy. There are a lot of factors that play into how well the software places you on a map. One how good the base map coordinates are. How good the receiver/signal to noise is, and how many birds are line of sight to your device. The more birds, and stronger their signals the better. There may be some software issues as well. My experience varies a great deal even with high end Garmin devices. One day dead on later in the day 50 to 100 meeters off from the same location. in the woods i loose signal frequently and thats with a Garmin GPS.
That said i have had days withe the PB where it couldn't find the minimal three number of sats it needed to locate me T all before the PB timed out. Othertimes after about 5 mins. it got me to within 20 feet which isn't that bad considering with the best equipment usually the best you can get is about 9 feet.Rob Robertson likes this.12-11-11 07:24 PMLike 1 - I have posted about gps on a couple of other threads. I don't believe your PB gps is defective. More than likely you could not acquire enought satelites to get greater accuracy. There are a lot of factors that play into how well the software places you on a map. One how good the base map coordinates are. How good the receiver/signal to noise is, and how many birds are line of sight to your device. The more birds, and stronger their signals the better. There may be some software issues as well. My experience varies a great deal even with high end Garmin devices. One day dead on later in the day 50 to 100 meeters off from the same location. in the woods i loose signal frequently and thats with a Garmin GPS.
That said i have had days withe the PB where it couldn't find the minimal three number of sats it needed to locate me T all before the PB timed out. Othertimes after about 5 mins. it got me to within 20 feet which isn't that bad considering with the best equipment usually the best you can get is about 9 feet.
Is there any settings I can change for the GPS ? You mentioned a minimal of 3 sats. Is there any app or settings I can check to see how may sats my PB is receiving ?
Which GPS program are you using with the Playbook ? Besides mapdroid, is there any other off-line gps program that works with the Playbook ?12-11-11 08:05 PMLike 0 - No - GPS receivers are multi channel. It should be attempting to receive from as many as it can "see" in the sky. However at different points during the day due to conditions, one may only receive one or two. Some times you might get four or five.12-12-11 09:06 AMLike 0
- I presume Mapdroid is an android app? I am not on the beta. I don't know if any of the various gps apps show the satellites.12-12-11 10:08 AMLike 0
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How long do I have to stand outside in an open field to pickup 3 or 4 satallite signals ? I don't know much about gps, but I've heard there is a difference between gps and A-gps and one of these can take up to 13 minutes to lock onto enough satallites to be accurate.12-15-11 09:34 PMLike 0 - The way that GPS events are handled by the app definitely have a bearing. The initial OS implementation was quite flaky actually and we developers learned some tricks to improve the performance. If I remember correctly, the events sometimes stopped being sent for no apparent reason. Or if you grabbed the very first event, you were in trouble because an accurate fix is only available on the 6th, 7th or 8th event. Perhaps the workarounds that we implemented are still required - it's hard to say. I have Magellan too and there is never a problem. I have received no complaints about the implementation in my app either.12-15-11 09:57 PMLike 0
- If this is a "fresh" unit, you might have to stand there for a number of hours before it's got the ephemeris data from all the satellites. Very likely in half an hour or less it will have it from most satellites currently visible, however, and in any case it's a near certainty you'll have well over 4 at almost any time of the day, unless you live in strange places.
This is pure standalone GPS though, not assisted (yet). Not sure about the 13 minutes, but it can be a while.
If you consistently get a reading 100 metres off, you're probably in some location (near a tall building?) where you're getting reflections that are throwing it off. There's not much reason it should be wrong otherwise.
I've posted in the past a number of things, which are still good advice. Here's a subset:
1. don't cover the lower right corner (to right of logo) with your hand, as that's where the antenna is
2. consider resetting your tablet first if it's not getting readings at all... there's a bug that can make GPS fail hard under some conditions, until you reset it again
3. try disabling the radios (BT and WiFi) as on some units the WiFi at least can significantly screw up the GPS signal (at least with current software)12-15-11 09:58 PMLike 0 - GENERALLY, once you have locked in satellites, the next time should be fairly quick. A gps downloads an almanac of where satellites are and uses that to calculate where they should be based on the time difference for the next use. If you move away from that location (I don't know distances) or don't use it for a while, it will again need to find the current position of satellites. But if you use it to drive 100 or 500 miles, it will be gathering that info. So turn if off and back on the next day and it should find you. Even a day or two later, it should be reasonably fast. It does not have to be totally open but it helps.
I can get the pb to find me inside my woodframe/shingled home on its second floor but not on the first floor.12-15-11 10:02 PMLike 0 - i find, when I turn off my wifi, then my mapdroid program does not locate me. I thought it was suuposed to work without a wifi connection (ie: offline mode) ?12-16-11 11:28 PMLike 0
- I finally had a chance to do some proper testing outside. I do not have any wifi or 3G service for my playbook. While walking around outside, I started up mapdroid. Within about 1 minute (and periodically clicking the "my location" option) it pinpointed me on the map to within a few feets of my location. So I guess my GPS does work properly and I do not need wifi or 3G service at all.mossfoot likes this.12-21-11 08:38 PMLike 1
- I finally had a chance to do some proper testing outside. I do not have any wifi or 3G service for my playbook. While walking around outside, I started up mapdroid. Within about 1 minute (and periodically clicking the "my location" option) it pinpointed me on the map to within a few feets of my location. So I guess my GPS does work properly and I do not need wifi or 3G service at all.12-21-11 11:23 PMLike 0
- Thx 4 the info on PB's GPS. What is MapDroid listed as in app world? i couldn't find it under search or in the GPS area. Thx.
edit/PS: does Magellan require constant web access,eg tethering, or can it function standalone like MapDroid?Last edited by ribsandbbqbeef; 12-22-11 at 02:47 PM.
12-22-11 02:14 PMLike 0 - NM, found out MapDroyd is an android app, and Magellen needs continuous web access to work well for gps nav.12-22-11 03:15 PMLike 0
- Yes, Mapdroid is an android app. You'll have to update to the 2.0x beta version and then load the mapdroid.bar file.12-27-11 09:57 PMLike 0
- OK is there a way to calibrate the GPS? I have 2 playbooks and one seems to work better than the other. My 16 sometimes has trouble acquiring a signal but once it does its fine. The 64 gig is faster but less accurate. Is there any solution. For example blutorq reads my speed perfect on the 16 gig but is all over the board on the 64.
Oh instead of a new thread I thought I'd hijack this one.
Sent from my AT100 using Tapatalk02-24-12 04:02 PMLike 0 - GPS has no calibration.
I think it's likely the cause of the difference in accuracy you're seeing is that the one unit has up-to-date ephemeris data on more of the satellites than the other, so it is able to use more of them in calculating your position. If I'm right, leaving both running GPS for some hours, or using both regularly over some days (it's effectively random which satellites are up and which are down during a given period of the day), will eventually result in them having nearly identical results.
It's also possible one has a defect, or that they were built at quite different times and there's been a design change that improved things (or, conceivably, a tradeoff that made it worse in favour of improving something else).
But there's no calibration possible...02-24-12 04:24 PMLike 0 - GPS has no calibration.
I think it's likely the cause of the difference in accuracy you're seeing is that the one unit has up-to-date ephemeris data on more of the satellites than the other, so it is able to use more of them in calculating your position. If I'm right, leaving both running GPS for some hours, or using both regularly over some days (it's effectively random which satellites are up and which are down during a given period of the day), will eventually result in them having nearly identical results.
It's also possible one has a defect, or that they were built at quite different times and there's been a design change that improved things (or, conceivably, a tradeoff that made it worse in favour of improving something else).
But there's no calibration possible...
Sent from my AT100 using Tapatalk02-24-12 04:53 PMLike 0 - I finally had a chance to do some proper testing outside. I do not have any wifi or 3G service for my playbook. While walking around outside, I started up mapdroid. Within about 1 minute (and periodically clicking the "my location" option) it pinpointed me on the map to within a few feets of my location. So I guess my GPS does work properly and I do not need wifi or 3G service at all.02-24-12 06:02 PMLike 0
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