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 mmsi , imo , 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.

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