Current Atlas of Juan de Fuca Strait to Strait of Georgia

 
Current atlas of the San Juan and Gulf Islands, and the Straits of Juan de Fuca and Georgia.  For use with the Washburn Tables which are updated yearly. 
Includes charts for determining the approximate tidal stream pattern at a specified time, charts for determining the change in tidal stream flows over a 25 hour period of a typical large or small tide, and the current flow patterns for three hours before low water, at low water, and for three hours after low water for small, medium, and large river discharges.

Spiral bound.