In document NAV 45/7/4 the Organization was invited to make an assessment of the contribution to navigation performance of vessel technical error, charts and a future GNSS. It was recommended that urgent consideration be given to producing charts, cost-effectively, to an accuracy consistent with a GNSS and to a common datum.
2.2 The Working Group was of the opinion that developments reflected in the attached report to NAV 45/7/4 could be used, to some extent, for review of resolution A.860(20) and Members should be invited to consider the report and submit their comments and proposals to NAV 46 for consideration with a view to revise resolution A.860(20).
Practical difficulties with Differential Correction System
2.3 The Working Group was informed by the IALA representative that discussions had taken place in IALA on the practical difficulties with Differential Correction Systems in achieving the performance required of resolution A.81 5(19) - World-Wide Radionavigation System.
2.4 Taking into account the fact that some Member States had experienced difficulties meeting the requirements of resolution A.815(19), IALA offered to analyse these standards, including their definitions and levels, and inform the Organization accordingly.
Guidance on chart datums and the accuracy of positions on charts
2.5 The Working Group was informed by IHO (NAV 45/7/2) that while nearly all the hydrographic offices of coastal States were promulgating guidance on chart datums, they were almost unanimously of the opinion that an IMO SN Circular containing guidance on chart datums and the accuracy of positions on charts would be beneficial. France and the Russian Federation felt that an SN Circular would be a duplication of the work done by hydrographic offices.
2.6 The Working Group agreed on the draft SN Circular - Guidance on chart datums and the accuracy of positions on charts, given in annex l, and recommended to invite the Committee to approve it.
Third meeting of the Global Navigation Satellite System Panel (GNSSP/3)
2.7 The Working Group noted the information provided by ICAO (NAV 45/INF.6) giving details of the outcome of the third meeting of the Global Navigation Satellite System Panel (GNSSP/3) held in Montreal. 12 to 23 April 1999, which was of relevance to the work of IMO, especially on the issue of development of guidelines for the long-term GNSS. The GNSS Panel had stressed the importance of ICAO co-ordination on GNSS with organizations representing other modes of transport, particularly with IMO, and had made a recommendation to this effect.
DEVELOPMENT OF PERFORMANCE STANDARDS FOR NIGHT VISION EQUIPMENT FOR HIGH SPEED CRAFT
2.8 The Working Group considered the report of the Technical Working Group at NAV 44 (NAV 45/7, paragraph 2.3 and annex 1) and the comments submitted by ISO (NAV 45/7/3) and agreed a draft MSC resolution on Performance standards for night vision equipment for High Speed Craft (HSC), given in annex 2.
