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[aprssig] APRS resolution

Ken H> sailingtoo at gmail.com
Fri Oct 5 14:34:08 UTC 2007


Does not look like there are many digi's on my route north riding up
US45 or state hwy 17....

Ken H>

On 10/5/07, Ken H> <sailingtoo at gmail.com> wrote:
> Wes, you have stated it so clearly - thanks for the input.  I'm outta
> here - gotta head up home toward N. Alabama.  Look for my APRS
> positions K9FV-1 on the bike.  We'll see how many *hits* I get on the
> ride north.
>
> This site seems to be about the best for tracking -
> http://aprs.he.fi/?call=K9FV-1 - there are a couple others that are
> good also...
>
> I'll be running WIDE1-1,WIDE2-2 with PL100 and Voice Alert.
>
> 73 de K9FV
>
> On 10/5/07, Wes Johnston, AI4PX <wes at ai4px.com> wrote:
> > When we started with gps units when selective availablility was on, my GPS
> > would "wander" within a 25 to 35 meter circle.  At that time, 20 meters for
> > an aprs position made sense.
> >
> > The day SA was turned off, my GPS started wandering in a 5 meter circle.
> >
> > WAAS came along and my gps wanders in a 2 or 3 meter circle.
> >
> > So at a glance it makes sense to have aprs resolution go to 2 meters.
> > (accuracy and precision belong to the GPS, _resolution_ belongs to the
> > protocol used to convey the information). While, yes it's true that my gps
> > Try explaining
> > to a lay person why an object placed in a parking lot is within a 60ft
> > box.... which is two rows over and several parking spaces away from where
> > the object actually is.
> >
> > Wes
>




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