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+--- Thread: GPSNavX & AIS Receivers (/thread-357.html)
GPSNavX & AIS Receivers - Eclipsemullet - August 20, 2007
I have got our NASA AIS working okay but a lot of the ships are showing as '???'.
What does that signify?
- GPSNavX - August 20, 2007
It means the vessel's name has not been received by your single channel AIS receiver. Read up on the frequency of the timing and availability of AIS data here..
http://www.navcen.uscg.gov/enav/ais/what_AIS_broadcasts.htm
Static information such as vessel name does not update as frequently as dynamic real time data such as speed and course.
- Eclipsemullet - August 21, 2007
So, would I be right in thinking that the NASA engine is a Class A receiever?
http://www.navcen.uscg.gov/enav/ais/types_of_AIS.htm