dear "M. Adam Davis",

I not able to remember over 2000 locations inside
Netherlands only.
Within Germany there are also around 2000 camera
loctions.
I know in UK and FR the use the same (GATSORADAR)
cameras.
Not sure how many there are.
Most time you know there is a camera on the road,
but where is it stand exacly...?
FLITS/FLASH  oeps there it was......

I think only the LON/LAT will do the trick.
All these info is present i the GPS $GPRMC string.
In $GPRMC is also, heading and speed over ground.

The only GPS NMEA string needed,
look like its the $GPRMC...
The rest of the GPS, could be rejected.

Bertus.


> So all he needs is a PIC which will take the current
> location, output by
> the GPS, and calculate the distance to a known set
> of points, triggering
> an alarm when a trap is within .5km or something?
>
> Since the distances are so small, one could even
> ignore the great circle
> equations, and go straight to the square root of the
> sum of the squares
> of the differences in latitude and longitude.  Could
> probably perform a
> few tricks there as well using tables, or by
> alarming when both lat and
> long are within one mile of the trap's lat and long.
>  Since the GPS only
> updates every second, it'd have a full second to
> compare the current
> position with the table of traps, which is plenty of
> time.
>
> The hardest part, in fact, would probably be the
> serial reception and
> NMEA parsing, and deciding how to store the trap
> coordinates.
>
> Of course, it would be better to use APRS and a
> radar detector so you
> could warn others of mobile speed traps you find as
> well.
>
> -Adam
>
> Nick Ray wrote:
>
> >The system uses a database of known speed trap
> locations and alerts you when
> >the GPS position nears one of them. There are one
> or 2 commercial systems
> >availiable here in the UK, but I don't know
> accurate their data is.
> >
> >Useless for mobile traps though..
> >
> >>What is it that you plan on doing with the GPS?
> How is the GPS supposed
> >>to warn you of a speedtrap?
> >>
> >>-Adam
> >>
> >>APRS Mobiel wrote:
> >>
> >>>>>Hello to you all,
> >>>>>
> >>>>>My name is Bertus Living in Netherlands,
> retired
> >>>>>
> >>>>and
> >>>>
> >>>>>also a heavy hamradio user.
> >>>>>
> >>>>>Some time ago getting a idea to make speedtrap
> >>>>>warning device with help using normal GPS
> >>>>>receivers.
> >>>>>
> >
> >--
> >http://www.piclist.com hint: PICList Posts must
> start with ONE topic:
> >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other
> [BUY]:,[AD]: ->Ads
> >
> >
> >
> >
> >
>
> --
> http://www.piclist.com hint: PICList Posts must
> start with ONE topic:
> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other
> [BUY]:,[AD]: ->Ads
>
>


__________________________________________________
Do You Yahoo!?
Find a job, post your resume.
http://careers.yahoo.com

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics