Duplicated Entries due to Unexpected Values
Sometimes, the messages we collect have some malformed fields or unexpected values due to any of the following reasons:
- Message corruption (somewhere in the message transmit/receive path)
- AIS equipment misconfiguration by the vessel captain
- Fields manually input by the vessel captain contain typos, shorthand notation, unexpected messages, etc.
Any of the above, especially if it results in an unexpected value for
call_sign , or
name , can make it difficult to identify whether the unexpected value is from an already identified vessel or a new vessel.
This can sometimes result in a single vessel getting multiple entries in the vessels database.
How Spire Sense accounts for duplicates
As of December 2017, less than 3% of MMSIs in the Vessels API have duplicate entries. The intelligence built within Spire Sense becomes increasingly able to determine a unique source of truth for ships in the ocean as it receives more AIS messages over time.