[Loadstone] Loadstone as a gps receiver

Ari Moisio arimo at iki.fi
Wed May 7 20:34:08 BST 2008


  I use the emulator with WFA following way: i start the emulator with some 
known location, for example my home. Then i select vicinity favourites and 
look distance and direction to that favourite.  I enter those values to 
the emulator, it calculates a new location based on that information and 
begins to transmit a new location data. Now i can copy the new  lat & lon 
values to the LS database.

  When transferring locations from LS to  WFA i enter LS location directly 
to the lat & lon coordinates  and store the location as a favourite with 

The program itself is quite simple; it keeps location, altitude, heading 
and other gps information in variables and transmits them continyously. If 
it receives a command to alter any value it perform required calculations, 
updates relevant variables and continues to transmit gps data, gga, rmc 
and gsv once in a second. Time information is retrieved from the 
computer's clock, there is no need for extreme accuracy. In fack,
a 'sleep(1)' after each group of sentences is the only timing source.

  The code is written in perl and the interface is written as a bash 
script. The whole project is currently at prooff-of-concept-stage but will 
someday got a ncurses/web interface.

You can still escape from the Gates of hell: Use Linux!
mr. M01510

On Tue, 6 May 2008, Shawn Kirkpatrick wrote:

> I'm not sure how this functionality would allow wf access users to transfer
> points to loadstone. Turning loadstone in to a receiver would be rather
> difficult I think since it's not going to be able to transmit a continuous
> data stream.
> The one feature we do want is the ability to playback an nmea log file. Then
> you could simulate a receiver by playing back a previously recorded trip. If
> you could write an emulator in linux that could playback an nmea log (at the
> correct output speed) I'd be interested in that code.
> On Tue, 6 May 2008, arimo at iki.fi wrote:
>> Hi
>>  I know, the subject sounds a bit weird.
>>  I made a demonstration of different gps applications today indoors but
>> couldn't show all the features without a gps coverage.  Because i have
>> earlier made a  Linux application that emulates a receiver i though
>> similar feature would be handy in a mobile phone. Because LS already has
>> an ability to move virtually in the map it's functionality could be
>> extended to transmit relevant location information via bluetooth to
>> another navigation application. With this functionality user can for
>> example send LS points to any bluetooth-capable navigator. WF Access users
>> could also transfer their favourites into LS.
>>  On my emulator only gga, rmc and gsv sentences are used. Emulator has
>> commands to set lat and lon coordinates separately, could transmit any
>> speed, heading and altitude data and has function to perform a simple move
>> n meters to direction x. or move continuously at given speed to given
>> direction.
>> You can still escape from the Gates of hell: Use Linux!
>> --
>> mr. M01510
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>> Loadstone at loadstone-gps.com
>> http://www.loadstone-gps.com/mailman/listinfo/loadstone
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