Worksheet 745 · Skill 5

Set and drift

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1. At 1435 your fix is 045°T, 2.2 nm from Heron Point Light. You steer 320°T at 4.8 kn through the water. At 1530 a new fix puts you 047°T, 2.9 nm from Westfield church spire.

   Plot the 1530 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 0820 your fix is 152°T, 2.6 nm from Tern Island tower. You steer 261°T at 4.2 kn through the water. At 0945 a new fix puts you 346°T, 1.6 nm from Heron Point Light.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0845 your fix is 299°T, 2.0 nm from Tern Island tower. You steer 067°T at 4.4 kn through the water. At 0930 a new fix puts you 048°T, 1.9 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1310 your fix is 036°T, 1.9 nm from Mill stack. You steer 311°T at 6.7 kn through the water. At 1350 a new fix puts you 019°T, 2.9 nm from Heron Point Light.

   Plot the 1350 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  

5. At 1600 your fix is 061°T, 3.7 nm from Westfield church spire. You steer 149°T at 5.2 kn through the water. At 1630 a new fix puts you 249°T, 2.0 nm from Tern Island tower.

   Plot the 1630 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 0710 your fix is 082°T, 2.2 nm from Westfield church spire. You steer 052°T at 6.4 kn through the water. At 0755 a new fix puts you 316°T, 2.9 nm from Tern Island tower.

   Plot the 0755 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  

7. At 0845 your fix is 132°T, 1.6 nm from Westfield church spire. You steer 058°T at 6.2 kn through the water. At 0930 a new fix puts you 283°T, 3.1 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1525 your fix is 211°T, 2.4 nm from Tern Island tower. You steer 285°T at 4.9 kn through the water. At 1605 a new fix puts you 266°T, 3.5 nm from Tern Island tower.

   Plot the 1605 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