Worksheet 31 · Skill 5

Set and drift

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1. At 1405 your fix is 206°T, 2.1 nm from Gannet Rock daybeacon. You steer 322°T at 6.0 kn through the water. At 1525 a new fix puts you 273°T, 2.3 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1220 your fix is 245°T, 1.9 nm from Tern Island tower. You steer 275°T at 5.2 kn through the water. At 1320 a new fix puts you 010°T, 1.5 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0720 your fix is 017°T, 1.5 nm from Westfield church spire. You steer 101°T at 5.3 kn through the water. At 0820 a new fix puts you 042°T, 3.1 nm from Heron Point Light.

   Plot the 0820 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  

4. At 0950 your fix is 353°T, 1.6 nm from Kittle water tank. You steer 012°T at 4.9 kn through the water. At 1030 a new fix puts you 081°T, 2.8 nm from Tern Island tower.

   Plot the 1030 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 1600 your fix is 207°T, 2.3 nm from Tern Island tower. You steer 344°T at 7.5 kn through the water. At 1635 a new fix puts you 311°T, 3.6 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1050 your fix is 259°T, 2.9 nm from Tern Island tower. You steer 001°T at 4.0 kn through the water. At 1125 a new fix puts you 326°T, 2.9 nm from Tern Island tower.

   Plot the 1125 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 1500 your fix is 045°T, 4.4 nm from Westfield church spire. You steer 242°T at 6.0 kn through the water. At 1535 a new fix puts you 032°T, 1.8 nm from Westfield church spire.

   Plot the 1535 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  

8. At 0815 your fix is 329°T, 2.0 nm from Mill stack. You steer 088°T at 6.1 kn through the water. At 0855 a new fix puts you 206°T, 2.0 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn