Seapath Diagnostics

Unfortunately, Seapath attitude messages ( $PSXN,23`) do not include any quality informatoion.  UHDAS should be configured to acquire ``$PSXN,20 for quality assesment.

$PSXN,20 messages

  • Example: Good quality attitude:
$PSXN,20,1,0,0,0*3A
$PSXN,20,1,0,0,0*3A
$PSXN,20,1,0,0,0*3A
$PSXN,20,1,0,0,0*3A
         ^ ^ ^ ^
         | | | |______ roll, pitch quality
         | | |
         | | |_________ heading quality
         | |
         | |___________ height quality
         |
         |______________ horizontal (position) quality
                         (apparently a 1 here is OK for UHDAS)


quality for:  horizontal, height, heading, roll&pitch.
quality: 0 = normal, 1 = reduced performance, 2 = invalid data
  • Example: Bad attitude:
$PSXN,20,1,0,1,0*3B
$PSXN,20,1,0,1,0*3B
$PSXN,20,1,0,1,0*3B
$PSXN,20,1,0,1,0*3B
             ^
             |_____________ reduced performance = BAD NEWS

On a UHDAS computer, you can query the logging system to see what the actual recent messages are by typing:

showlast.py -a20