EO X51.03 Identify Chart Symbols

Chart 1 is a publication containing explanations of the symbols, abbreviations and terms needed to interpret nautical charts published by the Canadian Hydrographic Service. Member nations of the International Hydrographic Organization produce Chart 1 using a common format. That common format consists of sections identified by letters and symbols, abbreviations or terms identified by a reference number.

Chart 1 is setup as a guide book, the listings are separated by letter. The column on the Left contains international symbols, the column on the right contains the CHS symbols, and in between is a description of the contents

Topography in the Chart 1 refers to identifying features on the land. These are things you can identify on the chart and visually to confirm your position. These include both person made and natural geographic features

Hydrography includes information about Tides, Currents, Depths, Nature of the Seabed , Rocks, Wrecks, Obstructions, Offshore Installations, Tracks for vessel traffic management, and Routes.