13.13.1 All equipment to which this chapter applies should be of a type approved by the
Administration. Subject to 13.13.2, such equipment should conform to performance standards
not inferior to those adopted by the Organisation.
13.13.2 Equipment installed before the adoption of performance standards by the Organisation
may be exempted from full compliance with the performance standards having due regard to
the criteria which the Organisation may adopt in connection with such standards.
Standard for Navigational equipment: