[OT] Navigation systems
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.
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
> 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.
>> 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:
>>> Richard Gaskin
>>> Fourth World
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