Worksheet 910 · Skill 5

Set and drift

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1. At 1310 your fix is 132°T, 1.4 nm from Westfield church spire. You steer 085°T at 5.7 kn through the water. At 1405 a new fix puts you 279°T, 1.4 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1215 your fix is 256°T, 3.7 nm from Tern Island tower. You steer 289°T at 4.1 kn through the water. At 1245 a new fix puts you 050°T, 3.1 nm from Westfield church spire.

   Plot the 1245 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  

3. At 0950 your fix is 064°T, 2.9 nm from Heron Point Light. You steer 294°T at 4.1 kn through the water. At 1020 a new fix puts you 095°T, 2.7 nm from Westfield church spire.

   Plot the 1020 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 1350 your fix is 032°T, 2.6 nm from Westfield church spire. You steer 135°T at 6.8 kn through the water. At 1425 a new fix puts you 039°T, 2.3 nm from Heron Point Light.

   Plot the 1425 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 1435 your fix is 027°T, 1.4 nm from Tern Island tower. You steer 293°T at 4.8 kn through the water. At 1510 a new fix puts you 344°T, 2.6 nm from Tern Island tower.

   Plot the 1510 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 1310 your fix is 039°T, 3.0 nm from Westfield church spire. You steer 119°T at 5.6 kn through the water. At 1400 a new fix puts you 214°T, 2.6 nm from Tern Island tower.

   Plot the 1400 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  

7. At 0745 your fix is 339°T, 1.7 nm from Tern Island tower. You steer 243°T at 5.6 kn through the water. At 0830 a new fix puts you 028°T, 3.1 nm from Heron Point Light.

   Plot the 0830 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  

8. At 0905 your fix is 353°T, 1.3 nm from Tern Island tower. You steer 277°T at 9.0 kn through the water. At 0945 a new fix puts you 036°T, 4.5 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn