[OT] Navigation systems

Mike Kerner MikeKerner at roadrunner.com
Thu Oct 17 20:33:09 CEST 2013


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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