Worksheet 152 · Skill 5

Set and drift

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1. At 0830 your fix is 063°T, 2.9 nm from Gannet Rock daybeacon. You steer 301°T at 4.1 kn through the water. At 0905 a new fix puts you 079°T, 3.3 nm from Tern Island tower.

   Plot the 0905 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  

2. At 0710 your fix is 114°T, 1.3 nm from Westfield church spire. You steer 113°T at 7.8 kn through the water. At 0800 a new fix puts you 214°T, 2.0 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0840 your fix is 351°T, 1.1 nm from Kittle water tank. You steer 004°T at 5.1 kn through the water. At 0935 a new fix puts you 085°T, 2.9 nm from Tern Island tower.

   Plot the 0935 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  

4. At 1515 your fix is 171°T, 1.5 nm from Tern Island tower. You steer 269°T at 7.4 kn through the water. At 1600 a new fix puts you 025°T, 3.3 nm from Heron Point Light.

   Plot the 1600 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  

5. At 0825 your fix is 194°T, 2.0 nm from Tern Island tower. You steer 296°T at 6.1 kn through the water. At 0855 a new fix puts you 265°T, 3.0 nm from Tern Island tower.

   Plot the 0855 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  

6. At 0830 your fix is 042°T, 3.2 nm from Tern Island tower. You steer 267°T at 9.0 kn through the water. At 0910 a new fix puts you 060°T, 3.8 nm from Westfield church spire.

   Plot the 0910 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 1315 your fix is 150°T, 1.6 nm from Westfield church spire. You steer 048°T at 5.3 kn through the water. At 1405 a new fix puts you 290°T, 3.2 nm from Tern Island tower.

   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  

8. At 1425 your fix is 037°T, 2.6 nm from Gannet Rock daybeacon. You steer 247°T at 7.2 kn through the water. At 1500 a new fix puts you 153°T, 1.2 nm from Tern Island tower.

   Plot the 1500 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