Navigation and tidal planning are great tools for planning your trips. In many places you will find that tides play a big effect in your trip; Tides can cause current, skookumchucks, tidal races, shallow beaches and expose reefs. All these can be fun, crazy or hard according to your experience level.
Plotting your location in the chart
Studying the Yuculta narrows
Timing the crossings
Yuri's notes In this class we use the rule of 50/90 and slow water rule