Why the app can't find the location in a foreign country?

Started by drbelette, May 31, 2011, 23:13:57

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drbelette

May 31, 2011, 23:13:57 Last Edit: January 01, 1970, 01:00:00 by Guest
Hi,

I have a Nexus S on Android 2.3.4 and the latest Locus Pro.

Last week, I've downloaded the map of Warsaw, Poland and tested that the app worked from home by forcing the offline mode (and by deactivating data globally on Android). But when I was in Warsaw for real, the app was unable to find my location...

I tried with the official Google Maps app too (even without data, as I was in a foreign country) and it couldn't find my location either! So the problem may not come from your app, but I can't understand what was the problem :| Maybe we have to wait a loooong time before the GPS could find our position?

Thanks :)
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rijackson741

#1
June 01, 2011, 00:11:09 Last Edit: January 01, 1970, 01:00:00 by Guest
The GPS will take longer to get a fix if you have moved a long way since the last time you used it (or if you have not used it for a long time) because it stores information about which satellites to look for. It can take 1-2 minutes sometimes.

Also, you will not get a fix if you are inside any sort of large building. That includes hotels, office blocks, supermarkets, etc. You may get a fix inside a house, but there's not much chance with anything bigger.

I have used locus in offline mode (including no data of any sort) in China, and it worked fine. The maps in China are a whole other story  :roll: , but Locus worked OK.
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rijackson741

#2
June 01, 2011, 00:26:38 Last Edit: June 01, 2011, 03:13:00 by rijackson741
More specifically, what you get if you have a data connection is Assisted GPS information. See here:

//http://en.wikipedia.org/wiki/Assisted_GPS

It's only good for a few days, and no good at all if you change location and don't have a data connection to update it. The GPS still works though.
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rijackson741

#3
June 01, 2011, 00:31:18 Last Edit: January 01, 1970, 01:00:00 by Guest
Quote from: "rijackson741"The GPS still works though.

Having said that, I just read on Wikipedia "Some aGPS devices do not have the option of falling back to standalone or autonomous GPS". That would suck! That's obviously not the case on my phone though, and you said you checked yours at home with the data connection turned off and it worked OK.
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drbelette

#4
June 01, 2011, 09:20:14 Last Edit: January 01, 1970, 01:00:00 by Guest
Hi,

Thanks, it makes sense. Without data, it can't use capabilities of A-GPS. Then I have to wait a long time, like any other GPS :)
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Menion

#5
June 01, 2011, 13:35:31 Last Edit: January 01, 1970, 01:00:00 by Guest
yes, agree with rijackson. I also heard that some phones without a-gps data (so week without internet) aren't able to compute gps location at all! Stupid ...
- Official help (ideas, questions, problems): help.locusmap.eu
- Advanced topics, sharing of knowledges: you're here!
- LM 4 Beta download, LM 4 final download
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drbelette

#6
June 01, 2011, 17:49:47 Last Edit: January 01, 1970, 01:00:00 by Guest
I guess it shouldn't be the case of my Nexus S, supposed to be the current flagship phone for Android :)
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