[OT] Navigation systems

Alex Tweedly alex at tweedly.net
Thu Oct 17 19:40:49 EDT 2013

It uses crowd-sourced wifi location info. Both Apple and Google collect 
(anonymous) info on wifi SSIDs and location (based either on GPS info 
when available or other nearby wifi APs which have a known location).

I believe at one time they may also have licensed (or indeed may still 
license) Skyhook's database.


-- Alex.

On 17/10/2013 19:33, Mike Kerner wrote:
> I have found that my non-cell-enabled ipad does surprisingly well on
> navigation, and I have yet to fully understand why.  After all, it
> supposedly doesn't have GPS in it, and it isn't connected to cell service
> so it can't be getting location from the towers, but somehow it frequently
> knows where it is and gives me turn-by-turn, live.
> There is a hypothesis from others that devices can pick up locations from
> wireless access points as they pass them, but I am not aware of the
> mechanism, since I believe that wireless access points are only supposed to
> broadcast their SSID's.  Otherwise, the trick of having your device
> auto-connect to multiple access points with the same SSID and password
> should fail.
> So try navigating more with your phone with wifi turned on.  You might be
> surprised.
> On Thu, Oct 17, 2013 at 11:57 AM, Peter Haworth <pete at lcsql.com> wrote:
>> Thanks for the pointers eveyone.  I have some reading to do!
>> Mike,  I never made the connection between aircraft boarding and navigation
>> before but you opened my eyes!  Incidentally, Southwest now have a "clump"
>> system layered on top of their no seat allocation rule. There are three
>> boarding groups (A,B,C) and within those groups, numbers from 1-60 (or more
>> for larger aircraft), with the group and number being assigned serially (I
>> think) in order of time checked in. The numbers aren't seat numbers, just
>> sequence numbers within the group. At boarding time, group A, numbers 1-30
>> go first, followed by group A numbers 31-60, and so on.
>> This all came about really because I'm using my Nexus 7 for navigation and
>> it does not have the LTE option on it so I'm not on the internet when
>> driving.  I found a few apps that will provide navigation when not
>> connected to the internet, which they do by downloading maps from an open
>> source mapping project.  Obvioulsy you have to get the necessary maps while
>> you have an internet connection but after that, the apps use the gps in
>> conjunction with the maps to figure out routes and navigate them.
>> I guess Google maps allows you to save maps and work offline but I found
>> that it has size restrictions that won't save maps that cover a large area.
>> Pete
>> lcSQL Software <http://www.lcsql.com>
>> On Thu, Oct 17, 2013 at 7:57 AM, Richard Gaskin
>> <ambassador at fourthworld.com>wrote:
>>> A good overview:
>>> http://en.wikipedia.org/wiki/**Travelling_salesman_problem<
>> http://en.wikipedia.org/wiki/Travelling_salesman_problem>
>>> --
>>>   Richard Gaskin
>>>   Fourth World
>>>   LiveCode training and consulting: http://www.fourthworld.com
>>>   Webzine for LiveCode developers: http://www.LiveCodeJournal.com
>>>   Follow me on Twitter:  http://twitter.com/**FourthWorldSys<
>> http://twitter.com/FourthWorldSys>
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