Worksheet 286 · Skill 5

Set and drift

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1. At 0800 your fix is 310°T, 2.4 nm from Tern Island tower. You steer 169°T at 6.5 kn through the water. At 0845 a new fix puts you 245°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 0845 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1120 your fix is 015°T, 2.0 nm from Mill stack. You steer 307°T at 4.2 kn through the water. At 1225 a new fix puts you 082°T, 2.3 nm from Westfield church spire.

   Plot the 1225 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1015 your fix is 300°T, 4.4 nm from Tern Island tower. You steer 163°T at 7.4 kn through the water. At 1100 a new fix puts you 340°T, 1.5 nm from Mill stack.

   Plot the 1100 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1545 your fix is 081°T, 2.9 nm from Westfield church spire. You steer 141°T at 6.2 kn through the water. At 1615 a new fix puts you 065°T, 2.8 nm from Heron Point Light.

   Plot the 1615 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1430 your fix is 071°T, 2.8 nm from Tern Island tower. You steer 219°T at 5.7 kn through the water. At 1550 a new fix puts you 227°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1550 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0730 your fix is 356°T, 2.2 nm from Tern Island tower. You steer 273°T at 6.8 kn through the water. At 0810 a new fix puts you 036°T, 3.0 nm from Westfield church spire.

   Plot the 0810 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1035 your fix is 068°T, 1.8 nm from Heron Point Light. You steer 044°T at 7.4 kn through the water. At 1105 a new fix puts you 254°T, 2.2 nm from Tern Island tower.

   Plot the 1105 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1550 your fix is 307°T, 4.2 nm from Tern Island tower. You steer 154°T at 8.8 kn through the water. At 1635 a new fix puts you 060°T, 1.9 nm from Mill stack.

   Plot the 1635 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn