[aprssig] Marathon Pace Generator

Robert Bruninga bruninga at usna.edu
Wed Mar 20 22:08:33 CDT 2013


WHich - which marathon?  The one I just did for the Annapolis
Striders, or the first one where I used APRSdr back in 1995 (Marine
Corps Marathon)?

On Tue, Mar 19, 2013 at 4:51 PM, Shawn Stoddard <stoddard at pobox.com> wrote:
> Which marathon?
>
> On Mar 19, 2013, at 14:47, Robert Bruninga <bruninga at usna.edu> wrote:
>
> Back in the 90’s, APRSdr was a version of APRSdos that would dead-reckon any
> number of runners along a Marathon route that was drawn on the map in
> purple.  Any object placed on the map on the purple line would begin to move
> at the indicated pace along the route and these objects would be updated and
> transmitted once a minute for the duration of the event.
>
>
>
> I just programmed such a DR engine into a basic stamp.  Just two wires to a
> TNC and it will generate a LEAD runner and a FEMALE lead on the map, moving
> along at Marathon pace.  No muss, no fuss.
>
>
>
> The value of this was 20 years ago at the start of APRS was for tracking the
> lead male and female runners without having to outfit them with GPS.  It was
> usually just as accurate as GPS back when GPS would not guarantee any better
> accuracy than 100 meters.   But even now, with most trackers only updating
> at 1 minute report rates (+/- 30 seconds of error or about 420 feet), the DR
> object is just as good .  Im adding buttons on the box to slightly increase
> or decrase the rates if reports from checkpoints appear to be ahead or
> behind the pace.
>
>
>
> During the Marathon this weekend, the organizers did not want a lead
> bicycle, so looking at the map gave no clue where the LEAD was (only the
> TAIL)..
>
>
>
> So as not to confuse everyone, Im going to use the object names of PACE for
> the lead runner and PACE-F for the lead female.  Then possibly one more for
> PACK which will have the typical average pace for typical marathons.
>
>
>
> The set up for our marathon needed only 23 points to define the route.
>
>
>
> Donno if anyone else would use this or not.  It can be just a dongle with a
> DB9 connector for plugging into any TNC or Tracker.
>
>
>
> Bob, WB4APR
>
>
>
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