Worksheet 168 · Skill 5

Set and drift

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1. At 1410 your fix is 124°T, 1.2 nm from Westfield church spire. You steer 065°T at 6.3 kn through the water. At 1455 a new fix puts you 275°T, 3.2 nm from Tern Island tower.

   Plot the 1455 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 1515 your fix is 056°T, 4.2 nm from Tern Island tower. You steer 214°T at 7.2 kn through the water. At 1625 a new fix puts you 241°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1625 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  

3. At 0730 your fix is 210°T, 2.4 nm from Tern Island tower. You steer 283°T at 4.9 kn through the water. At 0800 a new fix puts you 039°T, 2.9 nm from Heron Point Light.

   Plot the 0800 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  

4. At 1325 your fix is 277°T, 2.5 nm from Tern Island tower. You steer 223°T at 7.3 kn through the water. At 1355 a new fix puts you 007°T, 1.0 nm from Heron Point Light.

   Plot the 1355 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 1250 your fix is 037°T, 2.5 nm from Gannet Rock daybeacon. You steer 007°T at 5.0 kn through the water. At 1325 a new fix puts you 054°T, 3.8 nm from Tern Island tower.

   Plot the 1325 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  

6. At 1110 your fix is 253°T, 2.8 nm from Tern Island tower. You steer 299°T at 5.7 kn through the water. At 1145 a new fix puts you 033°T, 3.1 nm from Westfield church spire.

   Plot the 1145 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  

7. At 0900 your fix is 051°T, 1.5 nm from Gannet Rock daybeacon. You steer 033°T at 5.1 kn through the water. At 0930 a new fix puts you 036°T, 3.8 nm from Gannet Rock daybeacon.

   Plot the 0930 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 1315 your fix is 036°T, 1.4 nm from Heron Point Light. You steer 088°T at 6.1 kn through the water. At 1405 a new fix puts you 299°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1405 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn