If you use the Canadian Hydrographic Service Canadian Atlas of Tidal Currents -Volume 3, then you need the 2023 Waggoner / Ports and Passes Current Atlas Tables. This handy publication directs the user to the correct current chart in the Canadian Atlas of Tidal Currents - Volume 3 for every hour of every day throughout the year. Without the Current Atlas Tables, one must use a complicated nomogram and the tide tables for Point Atkinson to figure out which current chart is applicable at any given time. This little book is a must for skippers operating in the San Juan or Gulf Islands or in the Strait of Georgia and eastern Juan de Fuca Strait.