[aprssig] Dead Reckoning in APRS

Curt, WE7U archer at eskimo.com
Mon Jun 19 13:48:12 CDT 2006

On Sat, 17 Jun 2006, Robert Bruninga wrote:

> Those of us that are used to seeing this multi-dimensional represetation
> of the passage of time, space and distance on each mobile symbol or
> weather object feel very blind when we dont have it.  When I see a
> fixed-color-ICON on a map for a mobile or WX object without Dead
> Reckoning, I always wonder how old that posit is, a minuite? 30 minutes?
> a Day?, A week?

For SAR we wanted to know exactly that, how long had it been since
we heard from each team.  We added another display to Xastir (that
can be enabled/disabled) next to each symbol to display time since
last report.  It starts out as green text, then goes to yellow, then
to red at preset times.  This lets us know by color which teams
haven't been heard from.  We can then call them on the voice
frequency if necessary.

> Though at least most programs fade them to gray after the
> recommended 80 minutes I hope.

Configurable in Xastir.  Default 80 mins.

Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
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