Worksheet 290 · Skill 5

Set and drift

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1. At 1305 your fix is 342°T, 1.0 nm from Heron Point Light. You steer 022°T at 5.7 kn through the water. At 1405 a new fix puts you 296°T, 2.9 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0720 your fix is 067°T, 3.2 nm from Westfield church spire. You steer 142°T at 7.5 kn through the water. At 0755 a new fix puts you 019°T, 1.7 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1540 your fix is 029°T, 3.4 nm from Heron Point Light. You steer 133°T at 4.0 kn through the water. At 1610 a new fix puts you 356°T, 3.1 nm from Mill stack.

   Plot the 1610 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 0840 your fix is 023°T, 2.0 nm from Westfield church spire. You steer 086°T at 7.9 kn through the water. At 0930 a new fix puts you 342°T, 1.1 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0820 your fix is 087°T, 3.2 nm from Westfield church spire. You steer 047°T at 4.8 kn through the water. At 0905 a new fix puts you 338°T, 2.2 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0710 your fix is 229°T, 1.4 nm from Tern Island tower. You steer 260°T at 8.0 kn through the water. At 0745 a new fix puts you 093°T, 1.9 nm from Westfield church spire.

   Plot the 0745 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 0715 your fix is 065°T, 1.4 nm from Westfield church spire. You steer 142°T at 4.0 kn through the water. At 0845 a new fix puts you 237°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 0845 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0710 your fix is 286°T, 2.7 nm from Tern Island tower. You steer 068°T at 5.7 kn through the water. At 0740 a new fix puts you 008°T, 2.3 nm from Tern Island tower.

   Plot the 0740 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