Worksheet 759 · Skill 5

Set and drift

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1. At 0855 your fix is 049°T, 2.4 nm from Heron Point Light. You steer 333°T at 6.0 kn through the water. At 0925 a new fix puts you 062°T, 2.8 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0925 your fix is 060°T, 3.7 nm from Westfield church spire. You steer 125°T at 4.4 kn through the water. At 1040 a new fix puts you 147°T, 2.4 nm from Tern Island tower.

   Plot the 1040 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1535 your fix is 017°T, 2.1 nm from Heron Point Light. You steer 101°T at 5.2 kn through the water. At 1610 a new fix puts you 351°T, 2.5 nm from Mill stack.

   Plot the 1610 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  

4. At 0920 your fix is 029°T, 2.0 nm from Gannet Rock daybeacon. You steer 259°T at 8.5 kn through the water. At 1010 a new fix puts you 039°T, 2.6 nm from Heron Point Light.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0830 your fix is 216°T, 2.5 nm from Tern Island tower. You steer 343°T at 8.0 kn through the water. At 0900 a new fix puts you 309°T, 2.6 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0925 your fix is 029°T, 2.6 nm from Mill stack. You steer 298°T at 4.0 kn through the water. At 1000 a new fix puts you 232°T, 2.9 nm from Tern Island tower.

   Plot the 1000 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  

7. At 1435 your fix is 242°T, 2.0 nm from Gannet Rock daybeacon. You steer 301°T at 4.1 kn through the water. At 1525 a new fix puts you 214°T, 3.2 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0800 your fix is 352°T, 1.6 nm from Mill stack. You steer 072°T at 5.8 kn through the water. At 0855 a new fix puts you 089°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 0855 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