Worksheet 380 · Skill 5

Set and drift

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1. At 1505 your fix is 322°T, 3.0 nm from Tern Island tower. You steer 245°T at 7.3 kn through the water. At 1535 a new fix puts you 053°T, 2.2 nm from Westfield church spire.

   Plot the 1535 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  

2. At 1005 your fix is 312°T, 1.5 nm from Gannet Rock daybeacon. You steer 056°T at 4.1 kn through the water. At 1100 a new fix puts you 076°T, 3.5 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0820 your fix is 347°T, 2.5 nm from Tern Island tower. You steer 243°T at 4.9 kn through the water. At 0920 a new fix puts you 292°T, 4.0 nm from Tern Island tower.

   Plot the 0920 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1540 your fix is 026°T, 2.0 nm from Mill stack. You steer 301°T at 7.1 kn through the water. At 1615 a new fix puts you 032°T, 1.8 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1540 your fix is 263°T, 3.4 nm from Tern Island tower. You steer 162°T at 4.1 kn through the water. At 1640 a new fix puts you 003°T, 2.3 nm from Mill stack.

   Plot the 1640 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0835 your fix is 258°T, 2.8 nm from Gannet Rock daybeacon. You steer 312°T at 4.3 kn through the water. At 0945 a new fix puts you 048°T, 3.8 nm from Westfield church spire.

   Plot the 0945 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0850 your fix is 023°T, 2.3 nm from Gannet Rock daybeacon. You steer 014°T at 5.2 kn through the water. At 0925 a new fix puts you 070°T, 4.6 nm from Tern Island tower.

   Plot the 0925 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0905 your fix is 225°T, 1.6 nm from Gannet Rock daybeacon. You steer 272°T at 4.3 kn through the water. At 0945 a new fix puts you 002°T, 1.1 nm from Mill stack.

   Plot the 0945 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