Worksheet 936 · Skill 5

Set and drift

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1. At 1555 your fix is 050°T, 3.6 nm from Westfield church spire. You steer 090°T at 4.5 kn through the water. At 1625 a new fix puts you 285°T, 2.6 nm from Tern Island tower.

   Plot the 1625 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 1035 your fix is 067°T, 2.0 nm from Gannet Rock daybeacon. You steer 300°T at 4.2 kn through the water. At 1110 a new fix puts you 052°T, 1.5 nm from Tern Island tower.

   Plot the 1110 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 1250 your fix is 038°T, 3.2 nm from Tern Island tower. You steer 134°T at 6.2 kn through the water. At 1320 a new fix puts you 074°T, 4.1 nm from Tern Island tower.

   Plot the 1320 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 0705 your fix is 027°T, 2.3 nm from Kittle water tank. You steer 333°T at 9.0 kn through the water. At 0745 a new fix puts you 033°T, 2.9 nm from Tern Island tower.

   Plot the 0745 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 1400 your fix is 011°T, 1.9 nm from Westfield church spire. You steer 086°T at 8.5 kn through the water. At 1430 a new fix puts you 284°T, 3.9 nm from Tern Island tower.

   Plot the 1430 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 1240 your fix is 068°T, 3.7 nm from Westfield church spire. You steer 211°T at 4.5 kn through the water. At 1320 a new fix puts you 331°T, 1.9 nm from Heron Point Light.

   Plot the 1320 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  

7. At 1445 your fix is 242°T, 1.6 nm from Tern Island tower. You steer 214°T at 4.3 kn through the water. At 1540 a new fix puts you 012°T, 0.9 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1305 your fix is 248°T, 3.4 nm from Tern Island tower. You steer 012°T at 5.7 kn through the water. At 1345 a new fix puts you 306°T, 1.8 nm from Tern Island tower.

   Plot the 1345 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