3.3.2. Interpreting NMEA messages

This section shows the NMEA messages used for accurate heading on various ships. It is useful to be able to inspect the NMEA messages directly, to see the failure in the QA messages

• 3.3.2.1. Ashtech NMEA messages
  • 3.3.2.1.1. $PASHR,ATT messages
  • 3.3.2.1.2. $PASHR,AT2 messages
  • 3.3.2.1.3. $GPPAT messages
  • 3.3.2.1.4. Indications of bad data:
  • 3.3.2.1.5. checking on UHDAS computer
• 3.3.2.2. Seapath NMEA messages
  • 3.3.2.2.1. $PSXN,20 messages
• 3.3.2.3. POSMV NMEA messages
  • 3.3.2.3.1. $PASHR message
• 3.3.2.4. MAHRS messages
  • 3.3.2.4.1. TSS1 message
  • 3.3.2.4.2. Interpreting the Status Flag