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[aprssig] Re: The best resolution of position from APRS

Andrew Rich vk4tec at tech-software.net
Wed Jan 4 07:40:38 UTC 2006


So try this

Put your TNC into converse mode, you know when you hit enter it transmits.

But instead hook up your GPS receiver.

In theory every line of NMEA data has a return, so the TNC should just
UNPROTO it out

Quick and nasty APRS

-----------------------------------------
Andrew Rich - VK4TEC
vk4tec at tech-software.net <mailto:vk4tec at tech-software.net>
www.tech-software.net
Brisbane AUSTRALIA



-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of KC2MMi
Sent: Wednesday, 4 January 2006 2:59 PM
To: aprssig at lists.tapr.org
Subject: [aprssig] Re: The best resolution of position from APRS


<<That is not exactly correct as stated. All of the older
NMEA formats also allowed floating point precision
and supported positions down to 6 inches and all of
the kenwoods (except the very first D7's all of which
were recalled) all will decode that. >>

Bob, I suspect I agree most with the first sentence.<G>
How is a D7 going to decode what NMEA format to give 6" position rsolution,
when
the display physically is only doing DDD.MM.mm due to the available display
digits?

Do you mean it can pass the other strings along in "dumb one packet one
frame
TNC mode" ?
Or that it can show them if they are sent instead of a message? In which
case,
it still isn't really aware of them, it's just passing along another message
requiring manual interpretation.

I'm confused by your "new" position spec, I don't find any definitions of
your
DD.MM.HH format. What are the H's for? And do you mean, a human has to
manually
translate the DD.MM format and then manually add the other digits, which are
in
feet, to the lat/lon displayed? It sounds like an inelegant kludge, if that
is
being forced on the human operator in order to accomodate the Kenwood
limitations. (But, maybe I'm not at all understanding that right.)


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