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Take out "preference" for S-101 over S-57 in S-98 Annex C. #47
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Sections C-21 and C-21.1 (Ed 1.4.1) need to be populated with requirements on how to manage (load and display) S-57 & S101 data. We can't leave things completely up to OEMs if we want to have consistency. Producers and end users have to understand how things will work in practice. For producers, it will have a direct impact on the way they decide to re-scheme (or not) their S-101 cells and also the way they should plan their S-101 roll out plans. Very simplistically one would think that ECDIS will fill the screen with S-101cells based on the already agreed Loading and rendering algorithms and that the rest of the display window will be filled by S-57 ENCs based on current loading practices. Is up to producers to make sure they release their S-101 ENCs starting from their largest scale products. When MSVS is < S-101 ENC minimumDisplayScale the S-101 product should be removed. If no smaller scale S-101 cell exists, then the area is to be filled using an S-57 cell (as per current loading practices based on Compilation Scale and MSVS). I'm sure my logic has flaws but bottom line is ... we have to write down how S-57 and S-101 are to work together to fill up an ECDIS screen (whatever that looks like). Maybe 'Drawing Index' or MONG can now assist with this? |
As we now have the loading/rendering algorithms in S-98 Annex C (or at least, we will do in the next version), there is an opportuinity to strengthen the advice given to implementers on DF provision. Currently:
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TSM concluded after lengthy discussions that the current S-98 Annex C clauses requiring a "preference" for importing / loading (it doesn't specify which) S-101 over S-57 is technically unfeasible. This is currently documented in C-18.6
The primary reasons for this are:
the only part of the existing clause to be left in should be "The question of handling simultaneous display of data in old and new formats is still to be addressed by the IHO at the time this document is being written". If such guidance can be written it may be re-inserted but the technical, commercial and end user challenges / impacts seem unlikely this will ever be more than a preference.
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