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[aprssig] APRS resolution

Ken H> sailingtoo at gmail.com
Fri Oct 5 14:31:38 UTC 2007


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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