3.3.1 These performance standards are based on
a modular concept which should provide for individual configurations
and for extensions, if required.
3.3.2 These standards contain four modules:
- Module A for the requirements for the integration of navigational
information,
- Module B for the operational/functional requirements for INS based
on a task-related structure,
- Module C for the requirements of the Alert management, and
- Module D for the Documentation requirements.