# Commission Implementing Regulation (EU) 2018/1973 of 7 December 2018 amending Implementing Regulation (EU) No 909/2013 on the technical specifications for the electronic chart display and information system for inland navigation (Inland ECDIS) referred to in Directive 2005/44/EC of the European Parliament and of the Council, Division 2.1.1: Performance requirements

Extent: E+W+S+N.I.

The navigation system shall make reliable estimations of position and heading. Moreover, the estimations of position and heading shall be checked by the system for conformity with the required accuracy.
Position and heading information shall be calculated and displayed for the same reference position. This shall normally be the centre of the radar antenna. A new position estimate shall at least be available with every revolution of the radar antenna.

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Source: https://www.legislation.gov.uk/eur/2018/1973/annex/division/ELECTRONIC/section/4A/division/2/division/2.1/division/2.1.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2018-1973/annex/division-ELECTRONIC/section-4A/division-2/division-2.1/division-2.1.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.