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15404OT3 position decode error

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  • marcel
    Mar 29, 2013
      There appears to be an error in the formula that the OT3 firmware (Ver 56132) uses to decode compressed positions. Here's the beacon coming through an OT3:

      VE6SLP-9>APOTC1,EDMNTN*,WIDE1*:!/3F\[1kbg> st/A=002178 12.5V 24C HDOP00.8 SATS10
      $GPWPL,5334.36,S,11326.80,E,VE6SLP-9*23
      $PGRMW,VE6SLP-9,663,00AA,12.5V 24C HDOP00.8 SATS10*28

      and the same station coming through an OT2:

      VE6SLP-9>APOTC1,EDMNTN*,WIDE1*:!/3F\]1kbb> st 09.9V 13C HDOP01.3 SATS06
      $GPWPL,5334.36,N,11326.81,W,VE6SLP-9*2D
      $PGRMW,VE6SLP-9,0,00AA,09.9V 13C HDOP01.3 SATS06*24

      The math in the OT3 is putting the station south and east rather than the north and west where it actually is. All stations using uncompressed position beacons plot correctly.
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