Recommendations for Consistent ENC Data Encoding

1
Recommendations for Consistent ENC Data Encoding

• Barrie Greenslade
• TSMAD Chair

2
Background

• 2003, first published by IC-ENC.
• Targeted common consistency issues
• Introduced simple SCAMIN recommendations
• 2004 Endorsed by TSMAD and adopted by CHRIS
• July 2004 CL 47/2004 accepted by MS

3
Background

• April 2006, IC-ENC tasked by JTEWG (IC-ENC
  PRIMAR) to develop more comprehensive SCAMIN
  rules.
• Dec. 2006, SCAMIN consultative document
  distributed for comment.
• March 2007, as a result of an action from WEND
  the original paper was re-circulated for MS
  approval as a T.R. by CL 32/2007.

4
Background

• April 2007, new SCAMIN proposal trialled by
  Germany, Netherlands and UK.
• Early May 2007, proposal distributed to JTEWG and
  TSMAD members.
• Late May 2007, approved by JTEWG and forwarded to
  TSMAD for endorsement.
• June 2007, Endorsed by TSMAD subject to a further
  review of compilation scale mapping.

5
Background

• July 2007, voting on CL 32/2007 suspended by CL
  64/2007 due to
• Objections to the paper becoming a T.R.
• Newly developed SCAMIN rules
• Problems with the mapping between
  compilation/radar scales and navigation purpose
  (usage bands)

6
Background

• July Sept 2007 several revisions made on advice
  of TSMAD members and new version submitted to
  CHRIS for adoption.

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Analysis

• Major changes in new version are
• Navigation purpose removed from mapping.
• Clarification of compilation scale definition.
• New improved SCAMIN rules developed capable of
  being automated.
• May never be the perfect solution and relies on
  good cooperation between neighbouring producers.

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Conclusion

• Presentation of data in a seamless environment is
  critical to the users perception of data quality
• Safety contour display is often fragmented.
• New producers should adopt recommendations
  immediately.
• Established producers should do so at the
  earliest opportunity.
• (UKHO have modified 200 ENCs using the new
  version).

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Recommendations

• TSMAD chair recommends that CHRIS approves the
  new version of Recommendations for Consistent ENC
  Data Encoding and prepares a new Circular Letter
  seeking the approval of MS.
• Add as an annex to S-65 ENC Production Guidance.

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• Questions