Worksheet 597 · Skill 5

Set and drift

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1. At 1310 your fix is 025°T, 2.5 nm from Kittle water tank. You steer 357°T at 5.3 kn through the water. At 1355 a new fix puts you 037°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1355 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 1535 your fix is 266°T, 2.3 nm from Gannet Rock daybeacon. You steer 280°T at 4.3 kn through the water. At 1645 a new fix puts you 060°T, 3.6 nm from Westfield church spire.

   Plot the 1645 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0910 your fix is 246°T, 2.6 nm from Tern Island tower. You steer 293°T at 5.5 kn through the water. At 0940 a new fix puts you 066°T, 3.1 nm from Westfield church spire.

   Plot the 0940 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 0815 your fix is 036°T, 3.2 nm from Heron Point Light. You steer 120°T at 5.1 kn through the water. At 0845 a new fix puts you 259°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 0845 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 0715 your fix is 074°T, 2.3 nm from Tern Island tower. You steer 200°T at 5.8 kn through the water. At 0805 a new fix puts you 250°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 0805 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  

6. At 0725 your fix is 053°T, 2.4 nm from Heron Point Light. You steer 337°T at 5.1 kn through the water. At 0755 a new fix puts you 104°T, 2.5 nm from Westfield church spire.

   Plot the 0755 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 1525 your fix is 042°T, 4.3 nm from Gannet Rock daybeacon. You steer 286°T at 4.1 kn through the water. At 1635 a new fix puts you 082°T, 1.6 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1530 your fix is 014°T, 3.4 nm from Westfield church spire. You steer 164°T at 6.0 kn through the water. At 1605 a new fix puts you 091°T, 2.2 nm from Westfield church spire.

   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