PUB 102: International Code of Signals (Revised 2020)

The International Code of Signals (Pub 102) contains, in a single volume, a description and/or graphic depiction of all signals for visual, sound, and radio communications. 

This publication is intended to cater primarily to situations related to safety of navigation and personnel, especially when language difficulties arise. New editions are prepared and published by NIMA on an as-need basis. United States 1969 Edition (2020 Revised). 

The U.S./Russia Supplementary Signals for Naval Vessels Appendix was been reviewed and updated in 2020 by the Office of Chief of Naval Operations, Navy Plans, Policy, and Integration for Russia, Ukraine, and Arctic.