Originally Posted by petermoree
Rollover data shows ship as *moored* while it actually goes over 7 kts.
This message was persistent over a longer period (30 minutes at least) and was observed by various other vessels as well.
Since no one else has responded, I'll tell you what I think
it is based on a recollection of an earlier post or two.
The "moored" and "under way" status is not calculated by the software. It is a status sent by AIS. It is not sent based on movement, but on a setting on Class A transceivers. (I don't think Class B sends this status at all.)
So, in your case, that was operator error on the part of the ship.
If I remember correctly, the original post was the other way around. A moored ship was showing as being under way.