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Modes of Operation

PROPOSED AMENDMENT TO RESOLUTION A.817(19)

1. Add section 1.9 to the Introduction in the Annex to the resolution :

1.9 When the relevant chart information is not available in the appropriate form (see section 4), some ECDIS may operate in the Raster Chart Display System (RCDS) mode as defined in Appendix 7. Unless otherwise specified in Appendix 7, the RCDS mode of operation should conform to performance standards not inferior to those set out in this Annex.

2. Add a new Appendix 7 to the Annex to the resolution.

APPENDIX 7

RCDS MODE OF OPERATION

Whenever in this appendix reference is made to provisions of the Annex related to ECDIS, ECDIS must be substituted by RCDS, SENC by SRNC and ENC by RNC, as appropriate.

All paras of the Annex related to ECDIS are indicated as to whether they apply to RCDS, do not apply to RCDS, or are modified in order to apply to RCDS. These paras are followed by additional requirements for ECDIS in the RCDS mode.

1. INTRODUCTION

1.1 Para applies to RCDS.

1.2 When used in the RCDS mode of operation, an ECDIS with adequate back-up arrangements (see Appendix 6) used together with an appropriate folio of up-to-date paper charts as determined by the national administration (e.g., a chart folio composed of up-to-date charts of smaller scale than the RNCs used for navigation) may be accepted as complying with regulation V/20 of the 1974 SOLAS Convention.

1.3 - 1.7 Paras apply to RCDS.

1.8 RCDS should provide appropriate alarms or indications with respect to the information displayed or malfunction of the equipment (see Table 1 of this Appendix).

2. DEFINITIONS

2.1 Raster Chart Display System (RCDS) means a navigation information system displaying RNCs with positional information from navigation sensors to assist the mariner in route planning and route monitoring, and if required, display additional navigation-related information.

2.2 Raster Nautical Chart (RNC) means a facsimile of a paper chart originated by, or distributed on the authority of, a government-authorized hydrographic office. RNC is used in these standards to mean either a single chart or a collection of charts.

2.3 System Raster Nautical Chart Database (SRNCD) means a database resulting from the transformation of the RNC by the RCDS to include updates to the RNC by appropriate means.

2.4-2.5 Do not apply to RCDS.

2.6 Does apply to RCDS.

3. DISPLAY OF SRNC INFORMATION

3.1 Para applies to RCDS.

3.2 SRNC information available for display during route planning and route monitoring should be subdivided into two categories:

.1 the RCDS standard display consisting of RNC and its updates, including its scale, the scale at which it is displayed, its horizontal datum, and its units of depths and heights

.2 any other information such as mariner's notes.

3.3 Para applies to RCDS.

3.4 When a RNC is displayed on the RCDS, it should provide an indication advising the mariner if a more detailed (larger scale) RNC is available for the displayed area.

3.5 It should be easy to add to, or remove from, the RCDS display any information additional to the RNC data, such as mariner's notes. It should not be possible to remove any information from the RNC.

3.6 - 3.7 Paras do not apply to RCDS.

3.8-3.10 Paras apply to RCDS.

3.11 There should always be an indication if the ECDIS is operating in the RCDS mode.

4. PROVISION AND UPDATING OF CHART INFORMATION

4.1 The RNC used in RCDS should be the latest edition of that originated by, or distributed on the authority of, a government authorized hydrographic office and conform to IHO standards. RNCs not on WGS-84 or PE-90 should carry meta-data (i.e., additional data) to allow geo-referenced positional data to be displayed in the correct relationship to SRNCD data.

4.2 The contents of the SRNCD should be adequate and up-to-date for the intended voyage.

4.3- 4.8 All paras apply to RCDS.

5. SCALE

This section applies to RCDS.

6. DISPLAY OF OTHER NAVIGATIONAL INFORMATION

6.1-6.3 All paras apply to RCDS.

7. DISPLAY MODE AND GENERATION OF THE NEIGHBOURING AREA

7.1-7.4 All paras apply to RCDS.

8. COLOURS AND SYMBOLS

8.1 IHO recommended colours and symbols should be used to represent SRNC information.

8.2 Para applies to RCDS.

8.3 Para does not apply to RCDS.

8.4 Para applies to RCDS.

9. DISPLAY REQUIREMENTS

9.1-9.2 Paras apply to RCDS.

9.3 Para does not apply to RCDS.

9.4 Para applies to RCDS.

9.5 RCDS should be capable of displaying, simply and quickly, chart notes which are not located on the portion of the chart currently being displayed.

10. ROUTE PLANNING, MONITORING AND VOYAGE RECORDING

10.1-10.2 Paras apply to RCDS.

10.3 Para does not apply to RCDS.

10.4 Route Planning

10.4.1-.3 Paras apply to RCDS.

10.4.4-.5 Paras do not apply to RCDS.

10.4.6 Para applies to RCDS.

10.4.7 It should be possible for the mariner to enter points, lines and areas which activate an automatic alarm. The display of these features should not degrade the SRNCD information and it should be clearly distinguishable from the SRNCD information.

10.5 Route monitoring

10.5.1 Para applies to RCDS.

10.5.2 It should be possible to display a sea area that does not have the ship on the display (e.g. for look ahead, route planning), while route monitoring. If this is done on the display used for route monitoring, the automatic route monitoring functions in 10.4.6 and 10.4.7 should be continuous. It should be possible to return to the route monitoring display covering own ship's position immediately by single operator action.

10.5.3-4 Paras do not apply to RCDS.

10.5.5-6 Paras apply to RCDS.

10.5.7 RCDS should provide an alarm when the input from the positioning-fixing system is lost. RCDS should also repeat, but only as an indication, any alarm or indications passed to it from a position-fixing system.

10.5.8 Para does apply to RCDS.

10.5.9 The RCDS should only accept data referenced to the WGS-84 or PE-90 geodetic datum. RCDS should give an alarm if the positional data is not referenced to one of these datums.

10.5.10-13 Paras apply to RCDS.

10.5.14 RCDS should allow the user to manually align the SRNCD with positional data. This can be necessary, for example, to compensate for local charting errors.

10.5.15 It should be possible to activate an automatic alarm when the ship crosses a point, line, or is within the boundary of a mariner-entered feature within a specified time or distance.

10.6 Voyage recording

10.6.1-4 All paras apply to RCDS.

11. ACCURACY

11.1-11.2 All paras apply to RCDS.

12. CONNECTIONS WITH OTHER EQUIPMENT

12.1-12.2 All paras apply to RCDS.

13. PERFORMANCE TESTS, MALFUNCTION ALARMS AND INDICATIONS

13.1-13.2 All paras apply to RCDS.

14. BACK-UP ARRANGEMENTS

All paras apply to RCDS.

15. POWER SUPPLY

15.1-15.2 All paras apply to RCDS.

Table 1

ALARMS AND INDICATIONS IN THE RCDS MODE OF OPERATION

Para

Requirement

Information

3.11

Indication

ECDIS operating in the raster mode

3.4, 5.1

Indication

Information under-scale or overscale

5.2

Indication

Larger scale RNC available for the area of the vessel

6.2

Indication

Different reference system

10.4.6,

10.5.5

Alarm

Deviation from route

10.4.7,

10.5.15

Alarm

Approach to critical point, line, area or mariner-entered feature

10.5.7

Alarm

Loss of input from position fixing system

10.5.7

Indication

Repetition of alarm or indication from position fixing system

10.5.8

Alarm

Approach to critical point

10.5.9

Alarm

Different geodetic system

13.2

Alarm

Malfunction of RCDS mode

The definitions of indicators and alarms are given in Appendix 5

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