[ARDF] GPS considerations

[Don Pitchford]

 John,As it was explained to me by a more experienced ARDF competitor, GPS built into the receiver is being used for navigation purposes in the following way. As the participant runs tangent to a transmitter the angle to that transmitter is changing at a rate relative to the distance from the transmitter. Software in some receivers is said to be calculating this for the participant and displaying distance to the transmitter based on the rate of change of this angle as well as signal strength. Personally I must judge how rapidly the angle changes in order to estimate the distance since I don't have a receiver with built-in GPS that knows exactly where I am.Don, W9EBK
    On Monday, November 25, 2019, 08:03:03 AM CST, John Marriott <john.marriott at gmail.com> wrote:  
 
 Charles' pdf does not show up in the list. The reference for his White
Paper links to Apple Books & couldn't find a way to read it.

I disagree that IARU ARDF rules permit GPS to be used for navigation
purposes. The IARU Working Party discussed various issues regarding
technology & cheating at the Region 1 champs in Rogla 2 months ago.

John UK

On Mon, 25 Nov 2019, 11:55 , <ardf-request at lists.kkn.net> wrote:

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>    1. GPS Considerations (Charles Scharlau)
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> Message: 1
> Date: Sun, 24 Nov 2019 09:43:55 -0500
> From: Charles Scharlau <charles.scharlau at gmail.com>
> To: ardf at lists.kkn.net
> Subject: [ARDF] GPS Considerations
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> Several years ago the IARU Region 1 ARDF Working Group added a rule (T4.2)
> that permits the use of GPS devices lacking map displays. Some have assumed
> that there is no navigation assistance possible without a digital map.
> Those folks assumed that T4.2 effectively banned all GPS navigation
> assistance during a competition. Those persons were mistaken. There is
> considerable navigation support that GPS can provide to ARDFers even if no
> map is presented. Some have begun utilizing those GPS navigational aids in
> international competition.
>
> Having been an EE who worked with GPS as part of my job and hobbies, and
> having created several GPS-related App Store apps for smartphones, I
> believe that I can speak with some authority on the capabilities of GPS and
> the assistance it can provide. To encourage informed discussion on the
> subject I have written a white paper. It is available at no cost and may be
> shared freely by all. A pdf version is attached and the latest update to
> the white paper should always be accessible here:
> http://books.apple.com/us/book/id1488654197
>
> No national ARDF team wants to put itself at a disadvantage. Since GPS
> assistance is currently allowed under the rules applied to most ARDF World
> Championships (WC) there is strong pressure for the same assistance to be
> permitted at competitions used to determine national teams. Not doing so
> could
> prevent a team from being adequately equipped to compete against other
> teams that are fully utilizing GPS capabilities. Because of the
> gravitational tug to conform to WC rules, all national teams are affected
> by the decisions made by the dominant regional organizations. Therefore,
> all national organizations should represent their points of view on the
> subject to IARU regional ARDF rules makers.
>
> This thread is not for debating GPS issues. The facts are laid out in the
> white paper. Those who disagree with the facts or recommendations in the
> attached document should write their own white paper, or contact me
> directly with their concerns.
>
> 73,
> Charles E. Scharlau - NZ0I
> nz0i at openardf.org
>
>
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