# Commission Regulation (EU) No 965/2012 of 5 October 2012 laying down technical requirements and administrative procedures related to air operations pursuant to Regulation (EC) No 216/2008 of the European Parliament and of the Council, Division (a): Aeroplanes operated under VFR by day shall be equipped with a means of measuring and displaying the following:

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

(1) magnetic heading,
(2) time in hours, minutes and seconds,
(3)barometric altitude,
(4) indicated airspeed,
(5) Mach number whenever speed limitations are expressed in terms of Mach number, and
(6) slip for complex motor-powered aeroplanes.

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Source: https://www.legislation.gov.uk/eur/2012/965/annex/VIII/division/subpart+d/division/section+1/division/spoidea120/division/a (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-965/annex-VIII/division-subpart+d/division-section+1/division-spoidea120/division-a
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.