Loading ...
Sorry, an error occurred while loading the content.
 

RE: [aprsisce] GPRMC sentence in packet (correction?)

Expand Messages
  • Robert Bruninga
    ... Correct ... posits. ... Clarification: That was not the intent of the spec. The SSID method is only used on receipt of a position report that contains no
    Message 1 of 1 , Feb 13, 2013
      > In your case, AE0SS-11 would be given a balloon symbol.

      Correct

      > This is usually the source of some pretty random symbols
      > when the first (or only) packet(s) received from a station are not
      posits.
      > Such stations will typically have a symbol based on their -SSID...

      Clarification:

      That was not the intent of the spec. The SSID method is only used on
      receipt of a "position" report that contains no symbol information such as
      $GPRMC or other raw NMEA data. It should not be extended to the receipt
      of just any "first" packet.

      The intent of APRS on the receipt of just "any" packet prior to getting a
      position report is to assign the station in the system (station list) with
      the big question mark symbol and to give it a "vicinity" position using
      the best available information. Such as 1 mile ambiguity around the first
      digi in the path. If such a first digi is not obvious, then use the final
      digi. Using this ? symbol gives instant recognition that this position
      displayed is a "vicinity plot" pending receipt of any better position data
      later.

      In neither case should there be "random symbols"...

      > AE0SS-11>APRS:$GPRMC,151447,A,4034.5189,N,10424.4955,W,6.474,132.5,220
      > AE0SS-11>406,10

      Yes, definitely a balloon. Though the AE0SS station must not chop the
      NMEA data into two different packets as might appear here..

      Hope that helps.

      Bob, WB4APR
    Your message has been successfully submitted and would be delivered to recipients shortly.