This document recommends guidelines and requirements for developing a data interchange format for terrain, obstacle, and aerodrome data. A common database interchange standard is a key factor in successfully implementing digital functions in the aviation domain. Use of information contained in this document will help system designers assure a common interchange between data originators and data integrators.

DO-291B reflects all of the changes generated from the DO-272C updates to reflect Temporality, Aerodrome Surface Routing Network (ASRN) and the new data attributes. Editorial errors were also corrected.

Two related documents specify requirements for database content and quality:

- DO-272C, User Requirements for Aerodrome Mapping Information

- DO-276A, User Requirements for Terrain and Obstacle Data