Dinghy Sailing Theory Sessions

• Basic Chart Orientation - including cardinal and lateral buoyage systems
• Take bearings and measure distance on a chart
• Use a local tide table
• Tidal Streams
• IRPCS 

It’s called the 'Rule of Twelfths' because it says In the first hour after low water, the tide rises one twelfth of its range In the second hour after low water, the tide rises two twelfths of its range In the third hour after low water, the tide rises three twelfths of its range In the third hour before high water, the tide rises three twelfths of its range In the second hour before high water, the tide rises two twelfths of its range In the last hour before high water, the tide rises one twelfth of its range.