[aprssig] Re: !DAO! question

Andrew Rich vk4tec at people.net.au
Fri Mar 28 16:52:23 EDT 2008

What has happened to the aprs spec ?

the links dont work on the tapr site

----- Original Message ----- 
From: "Robert Bruninga" <bruninga at usna.edu>
To: "'TAPR APRS Mailing List'" <aprssig at lists.tapr.org>
Cc: "'Australian APRS Users'" <ozaprs at aprs.net.au>
Sent: Saturday, March 29, 2008 3:20 AM
Subject: RE: [aprssig] Re: !DAO! question

>> I just enabled the DAO support on the OT.
>> I can't see how this increases the resolution ?
>> So how does just by adding !W46! increase res ?
> The !DAO! Construct was invented to be able to add higher
> precision to all future APRS code that was fully backward
> compatible with all existing code.  In otherwords, existing code
> would still display the new object or station at at least the
> minimum precision that it already had.
> This prevents such new high-precision "senders" from
> disappearling off of all existing 30,000 users displays...
> Anyone can transmit !DAO! At any time.  But to receive and
> display that added precision, then the receving application has
> to implement the higher precision, parse the !DAO! and use it or
> display it.
> So get a client that supports it.  But higher precision is
> meaningless without sender and receiver using the same datums
> and corrections.  So that iw why DAO includes provision for that
> kind of handshaking as well
> Good luck
> Bob, WB4APR
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