Worksheet 88 · Skill 5

Set and drift

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1. At 1410 your fix is 232°T, 1.8 nm from Tern Island tower. You steer 129°T at 4.4 kn through the water. At 1500 a new fix puts you 189°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1500 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 1530 your fix is 079°T, 1.9 nm from Gannet Rock daybeacon. You steer 013°T at 4.1 kn through the water. At 1620 a new fix puts you 071°T, 4.1 nm from Tern Island tower.

   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  

3. At 0705 your fix is 225°T, 3.0 nm from Tern Island tower. You steer 156°T at 5.1 kn through the water. At 0735 a new fix puts you 237°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 0735 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 0915 your fix is 243°T, 2.0 nm from Tern Island tower. You steer 008°T at 4.7 kn through the water. At 0945 a new fix puts you 299°T, 1.5 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1430 your fix is 064°T, 1.8 nm from Westfield church spire. You steer 102°T at 6.3 kn through the water. At 1540 a new fix puts you 214°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1540 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1420 your fix is 026°T, 1.1 nm from Gannet Rock daybeacon. You steer 256°T at 4.0 kn through the water. At 1515 a new fix puts you 262°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1515 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 0845 your fix is 261°T, 1.9 nm from Gannet Rock daybeacon. You steer 319°T at 5.0 kn through the water. At 0925 a new fix puts you 294°T, 2.2 nm from Tern Island tower.

   Plot the 0925 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  

8. At 0845 your fix is 070°T, 1.6 nm from Gannet Rock daybeacon. You steer 311°T at 4.5 kn through the water. At 0915 a new fix puts you 095°T, 1.9 nm from Tern Island tower.

   Plot the 0915 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