Admiralty Guide to the Practical Use of ENCs. NP231. 2nd edition

Издание на английском языке
The propose of this publication is to assist mariners to acquire and maintain a high level of knowledge regarding the content and use of ENCs in ECDIS. It is intended to supplement and reinforce elements of ECDIS training on the use of chart data and its interpretation. It does not replace any of the training requirements set out in the international Maritime Organization (IMO) Model Course 1.27 or the Manila Amendments to STCW.
Navigation with ECDIS is fundamentally different from navigating with a paper chart. An ECDIS presents the navigator with a highly flexible display which, if correctly configured, offers a significant increase in situational awareness and safety. It should permit more time for the watchkeeper to maintain a proper visual watch. However, if the display and the ECDIS settings are not fully understood, then the chart display can be misinterpreted, and in the worst case the safety of the vessel compromised.

Contents
Introduction
Hydrographic Notes
Reference Publications
Terms and Definitions
1. What is an ENC
1.1 ENC format
1.2 ENC status
1.3 UKHOHDENC
1.4 ENC structure
1.5 ENC cells
1.6 ENC display
1.7 Traditional and Simplified symbols
1.8 ECDIS specific symbols
1.9 Supporting ECDIS symbology
1.10 Pick Reports - interrogating ENC data
2 User Controls for ENC Display
2.1 Introduction
2.2 ECDIS display modes
2.3 Colour Palettes - day and night use of ECDIS
2.4 Safety settings in ECDIS display
2.5 Display of depth shades
2.6 Shallow pattern
2.7 The Isolated Danger symbol
2.8 Alarms
2.9 Independent Mariner Selections
3. Further ENC Display Considerations
3.1 Introduction
3.2 ENC content and format considerations
3.3 ECDIS software considerations
4. ENCs and Display Scale
4.1 ENC compilation scales
4.2 Selecting appropriate display scales
4.3 Zooming in to a larger scale
4.4 Zooming out to a smaller scale
4.5 Display variability due to scale
5 ENC Accuracy
5.1 ECDIS and prudent navigation
5.2 The components of accuracy
5.3 Survey accuracy
5.4 Unreliable depths
5.5 Vertical datums
5.6 Horizontal datum
6. Voyage Planning with ENCs
6.1 Appraisal
6.2 Planning
6.3 Voyage execution and monitoring
7. Installing and Updating ENCs
7.1 Global ENC distribution
7.2 ENC installation
7.3 ECDIS validation checks
74 ENC updating
7.5 Display and review of integrated ENC updates in the SENC
7.6 Managing ENC service subscriptions
Annex 1. Timeline for mandatory carriage
Annex 2. List of S-57 feature objects and attributes, with cross-references to sections of guide
Annex 3. Attributes associated with Cardinal Buoy object
Annex 4. List of widely used ENC Producer Codes
Annex 5. IMO MSC (Maritime Safety Committee) Circular 1503/Rev. I 16 June 2017 - ECDIS -Guidance for Good Practise
Annex 6. Checking the IHO presentation Library edition number in the ECDIS
Annex 7. Glossary
Certificate of Authenticity