Worksheet 868 · Skill 5

Set and drift

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1. At 1340 your fix is 302°T, 3.4 nm from Tern Island tower. You steer 225°T at 5.9 kn through the water. At 1410 a new fix puts you 096°T, 2.9 nm from Westfield church spire.

   Plot the 1410 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  

2. At 0725 your fix is 071°T, 2.6 nm from Westfield church spire. You steer 353°T at 5.7 kn through the water. At 0755 a new fix puts you 017°T, 3.6 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0800 your fix is 172°T, 0.9 nm from Gannet Rock daybeacon. You steer 272°T at 4.4 kn through the water. At 0840 a new fix puts you 240°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0840 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 1325 your fix is 087°T, 1.6 nm from Gannet Rock daybeacon. You steer 006°T at 4.8 kn through the water. At 1405 a new fix puts you 033°T, 3.4 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1110 your fix is 001°T, 2.2 nm from Westfield church spire. You steer 089°T at 4.9 kn through the water. At 1240 a new fix puts you 326°T, 2.3 nm from Tern Island tower.

   Plot the 1240 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  

6. At 1150 your fix is 033°T, 3.6 nm from Westfield church spire. You steer 184°T at 5.6 kn through the water. At 1240 a new fix puts you 067°T, 1.1 nm from Heron Point Light.

   Plot the 1240 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 1240 your fix is 051°T, 2.2 nm from Heron Point Light. You steer 289°T at 5.7 kn through the water. At 1315 a new fix puts you 143°T, 1.3 nm from Westfield church spire.

   Plot the 1315 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  

8. At 1455 your fix is 221°T, 1.9 nm from Gannet Rock daybeacon. You steer 305°T at 7.3 kn through the water. At 1525 a new fix puts you 254°T, 2.9 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn