Worksheet 24 · Skill 5

Set and drift

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1. At 1025 your fix is 283°T, 3.8 nm from Tern Island tower. You steer 198°T at 4.2 kn through the water. At 1100 a new fix puts you 086°T, 3.3 nm from Westfield church spire.

   Plot the 1100 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  

2. At 0815 your fix is 255°T, 2.3 nm from Gannet Rock daybeacon. You steer 284°T at 4.0 kn through the water. At 0915 a new fix puts you 097°T, 1.5 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1600 your fix is 041°T, 1.8 nm from Gannet Rock daybeacon. You steer 268°T at 6.0 kn through the water. At 1720 a new fix puts you 069°T, 0.9 nm from Heron Point Light.

   Plot the 1720 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1510 your fix is 039°T, 2.1 nm from Mill stack. You steer 335°T at 4.5 kn through the water. At 1635 a new fix puts you 083°T, 3.2 nm from Westfield church spire.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0855 your fix is 256°T, 1.9 nm from Tern Island tower. You steer 160°T at 6.9 kn through the water. At 0930 a new fix puts you 027°T, 2.4 nm from Mill stack.

   Plot the 0930 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  

6. At 1550 your fix is 017°T, 3.5 nm from Westfield church spire. You steer 132°T at 4.8 kn through the water. At 1640 a new fix puts you 085°T, 3.5 nm from Westfield church spire.

   Plot the 1640 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 1440 your fix is 300°T, 4.1 nm from Tern Island tower. You steer 179°T at 5.2 kn through the water. At 1510 a new fix puts you 264°T, 3.2 nm from Tern Island tower.

   Plot the 1510 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  

8. At 0945 your fix is 037°T, 3.4 nm from Westfield church spire. You steer 181°T at 4.5 kn through the water. At 1015 a new fix puts you 088°T, 1.9 nm from Westfield church spire.

   Plot the 1015 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