Worksheet 270 · Skill 5

Set and drift

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1. At 0800 your fix is 337°T, 1.0 nm from Kittle water tank. You steer 299°T at 6.2 kn through the water. At 0900 a new fix puts you 212°T, 2.8 nm from Tern Island tower.

   Plot the 0900 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 1340 your fix is 072°T, 4.8 nm from Tern Island tower. You steer 289°T at 5.8 kn through the water. At 1415 a new fix puts you 041°T, 3.3 nm from Tern Island tower.

   Plot the 1415 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 0845 your fix is 299°T, 4.1 nm from Tern Island tower. You steer 140°T at 4.7 kn through the water. At 0940 a new fix puts you 231°T, 2.2 nm from Tern Island tower.

   Plot the 0940 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  

4. At 1445 your fix is 309°T, 3.8 nm from Tern Island tower. You steer 218°T at 7.6 kn through the water. At 1530 a new fix puts you 169°T, 1.4 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1155 your fix is 235°T, 3.1 nm from Tern Island tower. You steer 328°T at 7.6 kn through the water. At 1235 a new fix puts you 042°T, 3.8 nm from Westfield church spire.

   Plot the 1235 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  

6. At 0720 your fix is 091°T, 3.6 nm from Westfield church spire. You steer 099°T at 7.9 kn through the water. At 0815 a new fix puts you 051°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0815 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  

7. At 0745 your fix is 034°T, 1.3 nm from Heron Point Light. You steer 000°T at 4.7 kn through the water. At 0820 a new fix puts you 270°T, 3.5 nm from Tern Island tower.

   Plot the 0820 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 1515 your fix is 222°T, 3.5 nm from Tern Island tower. You steer 326°T at 8.5 kn through the water. At 1555 a new fix puts you 040°T, 4.8 nm from Westfield church spire.

   Plot the 1555 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