Worksheet 361 · Skill 5

Set and drift

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1. At 1530 your fix is 081°T, 2.6 nm from Westfield church spire. You steer 131°T at 5.3 kn through the water. At 1620 a new fix puts you 330°T, 1.8 nm from Mill stack.

   Plot the 1620 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  

2. At 1445 your fix is 134°T, 2.8 nm from Tern Island tower. You steer 020°T at 5.0 kn through the water. At 1525 a new fix puts you 066°T, 4.4 nm from Tern Island tower.

   Plot the 1525 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  

3. At 0805 your fix is 036°T, 2.2 nm from Tern Island tower. You steer 090°T at 4.1 kn through the water. At 0845 a new fix puts you 074°T, 4.3 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1455 your fix is 269°T, 1.3 nm from Gannet Rock daybeacon. You steer 265°T at 4.4 kn through the water. At 1535 a new fix puts you 043°T, 2.8 nm from Heron Point Light.

   Plot the 1535 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 0815 your fix is 326°T, 1.6 nm from Kittle water tank. You steer 281°T at 5.7 kn through the water. At 0910 a new fix puts you 320°T, 1.8 nm from Mill stack.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1225 your fix is 258°T, 3.0 nm from Gannet Rock daybeacon. You steer 272°T at 4.5 kn through the water. At 1300 a new fix puts you 038°T, 0.9 nm from Heron Point Light.

   Plot the 1300 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 1550 your fix is 044°T, 4.6 nm from Westfield church spire. You steer 154°T at 7.4 kn through the water. At 1635 a new fix puts you 063°T, 2.2 nm from Heron Point Light.

   Plot the 1635 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 1005 your fix is 257°T, 2.8 nm from Tern Island tower. You steer 102°T at 7.4 kn through the water. At 1050 a new fix puts you 155°T, 2.5 nm from Tern Island tower.

   Plot the 1050 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