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

KC2MMi kc2mmi at verizon.net
Wed Jan 4 04:59:02 UTC 2006


<<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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