[bug] AGPS uses wifi positioning even when wifi is turned off

asked 2015-04-21 22:43:01 +0300

ovekaaven gravatar image

updated 2015-04-21 23:16:24 +0300

When assisted GPS is on, the phone seems to be using nearby wifi networks to determine its position through the HERE service. Thus, when it sees my home wifi network, it thinks I'm at home, which is OK. But if I turn wifi off in Settings (to save power or whatever), it refuses to believe I'm still at home (even if GPS coverage is otherwise good enough). The GPS seems to jump around my neighborhood, to all kinds of positions outside the range of my home wifi network. Apparently, it believes that because it can't see my home wifi, I must necessarily be far away from it. (Of course, this is just an example, it probably applies to all wifis known to HERE.)

I think that if wifi is turned off, then the GPS shouldn't use the HERE service this way. It should use the real GPS, or the cell towers or whatever, but it should not use the lack of wifi as evidence of anything when wifi is turned off.

This is particularly annoying when I'm walking around the city with GPS-using apps and games, and have the wifi off because I don't need it there. (I rarely even need wifi indoors, for that matter! I've got 4G with a good data plan.)

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As you state the position "jumps around the neighborhood" does it really jump over-and-around your home, and not jump around the neighbourhood in general, I mean like it avoids the exact location and gets fixes outside some certain radius of your house?

Does it do this both when you are indoors and out on the yard?

juiceme ( 2015-04-21 23:55:07 +0300 )edit

Yes, it deliberately avoids my home. In fact, when I walk around the city, it avoids any position that would be within the range of a wifi network (such as near the university). That's the most annoying part.

Note that if I turn AGPS off, the phone gives me the correct position. With AGPS on, it doesn't. (If I go on the yard, it gets slightly closer, but still not as correct as with AGPS off.)

ovekaaven ( 2015-04-22 00:12:09 +0300 )edit

I should also have mentioned that the "jumps around" isn't very random. There are only so many spots nearby where there's absolutely no wifi network in range, and the GPS always jumps between those. It never picks a spot where any of my neighbors have a wifi in range.

ovekaaven ( 2015-04-22 00:40:04 +0300 )edit