This document contains two attitude data messages designed for applications involving data interchange in space data systems. The rationale behind the design of each message is described in annex B and may help the application engineer to select a suitable message. Definition of the attitude accuracy underlying a particular attitude message is outside of the scope of this Recommended Standard and should be specified via Interface Control Document (ICD) between data exchange participants. Applicability information specific to each Attitude Data Message format appears in sections 3 and 4, as well as in annex subsection B3.Cross References:ISO/IEC 8859-1:1998CCSDS 301.0-B-3:2002ISO 11104:2003CCSDS 505.0-R-1:2005IEEE Std 754-1985CCSDS 502.0-B-1:2004ISO 22644:2006Volume 7 of Recommendations and Reports of the CCIR: XVIIth Plenary Assembly, 1990CCSDS A00.0-Y-9:2003CCSDS 500.0-G-2:2005All current amendments available at time of purchase are included with the purchase of this document.