Worksheet 165 · Skill 5

Set and drift

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1. At 1030 your fix is 103°T, 2.2 nm from Westfield church spire. You steer 340°T at 4.1 kn through the water. At 1115 a new fix puts you 048°T, 3.8 nm from Westfield church spire.

   Plot the 1115 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  

2. At 1440 your fix is 299°T, 4.5 nm from Tern Island tower. You steer 168°T at 4.0 kn through the water. At 1530 a new fix puts you 222°T, 3.5 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0935 your fix is 344°T, 2.4 nm from Tern Island tower. You steer 129°T at 8.8 kn through the water. At 1020 a new fix puts you 047°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1020 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  

4. At 1555 your fix is 130°T, 1.6 nm from Westfield church spire. You steer 110°T at 4.3 kn through the water. At 1635 a new fix puts you 067°T, 2.6 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0940 your fix is 068°T, 2.2 nm from Gannet Rock daybeacon. You steer 213°T at 5.0 kn through the water. At 1010 a new fix puts you 137°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1010 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  

6. At 1515 your fix is 039°T, 2.4 nm from Tern Island tower. You steer 248°T at 7.5 kn through the water. At 1600 a new fix puts you 281°T, 3.3 nm from Tern Island tower.

   Plot the 1600 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  

7. At 0945 your fix is 113°T, 1.9 nm from Westfield church spire. You steer 058°T at 5.7 kn through the water. At 1035 a new fix puts you 307°T, 1.8 nm from Tern Island tower.

   Plot the 1035 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  

8. At 1250 your fix is 254°T, 3.4 nm from Tern Island tower. You steer 036°T at 4.7 kn through the water. At 1330 a new fix puts you 281°T, 2.0 nm from Tern Island tower.

   Plot the 1330 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