1. Overlapping ENC data: IC-ENC Policy and progress IC-ENC Chairman – Capt Marc Van Der Donck IRCC9, June 2017

2. Agenda Context IC-ENC Overlapping Data Policy
WENDWG : outcome, further activities
Conclusions

3. Context IHO Resolution on Elimination on overlapping ENC data
RHC asses areas with significant navigational differences: demonstrable risk to safety of navigation
“The RHC may seek the assistance of a Regional Coordination Centre to assist in this assessment”
Overlap real issue
Unpredictable behaviour in ECDIS
Agreed Logic rules (far) in the future
Better to treat at source
Powerpoint Title
12/9/201816/04/2012

4. IC-ENC Overlapping Data Policy

5. Summary of IC-ENC approach
A check for Overlaps is performed at each validation. If one is identified…
Is it possible to resolve?
Liaise between IC-ENC members
Liaise between IC-ENC member and other RENC or non- RENC member
Yes (technical) – great, all part of the RENC service , problem prevented!

6. Summary of IC-ENC approach
No (geopolitical?) –issue ENC is last resort
First: risk Assessment performed, reporting to both producers
Second: facilitation to reduce risk level before issue of ENC

7. Facilitation to reduce risk level before issue of ENC
IC-ENC will then facilitate the work of the two producers (e.g. by coordinating the exchange of data) to align the content of the affected ENCs to be as consistent as possible with each other, noting any fixed national production policies
This is to reduce, as far as possible, the level of risk resulting from variation in the charting of identical entities and/or identical geographic areas

8. Summary of Release:
After completion of this process (up to the pragmatic level of achievable agreement between the affected producers), issue overlapping ENC, but via a structured process:
List overlap in README.TXT file to VARs
Update Overlaps and Gaps Analysis spreadsheet
Includes risk assessment
Distributed to HO, RHC, WENDWG, IHO-secretariat as required
Policy can be found here:

9. Summary of Risk Assessment Structure
The following criteria are assessed by the IC- ENC Validator:
Content differences between the two ENCs
Geographic Location
Shipping Density
Size of Overlap
Scale of the ENCs
Routing patterns
ECDIS behaviour

10. Summary of Risk Assessment Structure
An ‘Overall severity of Risk’ is reached;
Low, Medium, High.
Structure, combination of
Rules
Use band 1, always low
Judgement call validator
Dominant criterion

11. Tracking Spreadsheet
Powerpoint Title
12/9/201816/04/2012

12. Summary table (April 2017)
( ) : previous period

13. The 5m international tolerance: an example

14. The 5m international tolerance: Buoy part of ENC 1

15. The 5m international tolerance: Buoy not part of ENC 2

16. WEND WG: outcome, further activities

17. OUTCOME WENDWG7
Endorsed IC-ENC’s policy with further discussion at IRCC
IC-ENC and Region F ENC Co-ordinator (France) to work together on MBSHC region as a pilot study
Each nation is responsible for assessing the risk of its overlaps
IC-ENC’s report is only for guidance.

18. IC-ENC Activity since WENDWG7
March/April 2017: National report provided to each member who has overlapping ENC data
National list of overlaps
Asked permission to share ENC data as required
April 2017: Attended Region F Charting Work Group (at IHO Assembly)
Briefed on policy developments
MBSHC overlap report and cover letter issued to all MBSHC members, in preparation for RHC meeting

19. IC-ENC Activity since WENDWG7
May 2017: Discussed at IC-ENC Technical Conference
HOs have found the report very useful, are using it to work towards resolving the overlaps identified in the reports.
Several nations highlighted that although they want to resolve all of the overlaps identified in their reports, significant effort and time is required to do so.
Malaysia described their multi-lateral approach to co- producing ENCs in certain regions, e.g. the Malacca Straits. This requires co-ordination effort, but means there is no overlapping data. Example of best practice.

20. Future IC-ENC Activity
September 2017: Steering Committee meeting
Review of policy / progress / value versus effort
Review of Region F trial
Ongoing: IC-ENC members to review and respond to national reports

21. Conclusions
Making an assessment of each instance of overlapping data is important and valuable
simply reporting the ‘number of overlaps in a region’ is useful, but is a little too crude).
IC-ENC’s risk assessment is for guidance only
The responsibility remains with the ENC Producers
Local factors may take precedence
IC-ENC’s efforts on overlap can only be directed towards IC-ENC members data
There are many remaining overlaps outside of this