Worksheet 515 · Skill 5

Set and drift

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1. At 0935 your fix is 204°T, 1.7 nm from Gannet Rock daybeacon. You steer 324°T at 4.1 kn through the water. At 1020 a new fix puts you 202°T, 2.2 nm from Tern Island tower.

   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  

2. At 1445 your fix is 074°T, 3.0 nm from Gannet Rock daybeacon. You steer 330°T at 7.0 kn through the water. At 1515 a new fix puts you 068°T, 3.6 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1445 your fix is 112°T, 1.4 nm from Westfield church spire. You steer 105°T at 7.6 kn through the water. At 1530 a new fix puts you 270°T, 2.3 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0930 your fix is 039°T, 3.6 nm from Gannet Rock daybeacon. You steer 295°T at 5.1 kn through the water. At 1000 a new fix puts you 051°T, 3.1 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0820 your fix is 031°T, 1.7 nm from Kittle water tank. You steer 292°T at 8.5 kn through the water. At 0855 a new fix puts you 249°T, 1.1 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1425 your fix is 029°T, 2.3 nm from Westfield church spire. You steer 056°T at 4.6 kn through the water. At 1455 a new fix puts you 031°T, 3.9 nm from Westfield church spire.

   Plot the 1455 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  

7. At 1025 your fix is 100°T, 2.4 nm from Westfield church spire. You steer 099°T at 5.5 kn through the water. At 1120 a new fix puts you 227°T, 1.9 nm from Tern Island tower.

   Plot the 1120 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 1530 your fix is 259°T, 3.1 nm from Tern Island tower. You steer 175°T at 4.4 kn through the water. At 1605 a new fix puts you 065°T, 2.6 nm from Heron Point Light.

   Plot the 1605 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