Worksheet 382 · Skill 5

Set and drift

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1. At 1040 your fix is 344°T, 1.3 nm from Tern Island tower. You steer 290°T at 5.2 kn through the water. At 1115 a new fix puts you 306°T, 3.5 nm from Tern Island tower.

   Plot the 1115 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  

2. At 1120 your fix is 124°T, 1.6 nm from Westfield church spire. You steer 053°T at 8.9 kn through the water. At 1205 a new fix puts you 318°T, 2.9 nm from Tern Island tower.

   Plot the 1205 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  

3. At 1215 your fix is 318°T, 2.4 nm from Tern Island tower. You steer 204°T at 4.1 kn through the water. At 1250 a new fix puts you 289°T, 2.5 nm from Tern Island tower.

   Plot the 1250 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 1310 your fix is 307°T, 4.1 nm from Tern Island tower. You steer 108°T at 6.3 kn through the water. At 1355 a new fix puts you 067°T, 3.1 nm from Tern Island tower.

   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  

5. At 0950 your fix is 300°T, 0.9 nm from Gannet Rock daybeacon. You steer 299°T at 4.9 kn through the water. At 1055 a new fix puts you 263°T, 3.5 nm from Tern Island tower.

   Plot the 1055 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0845 your fix is 352°T, 3.5 nm from Mill stack. You steer 352°T at 5.8 kn through the water. At 0935 a new fix puts you 050°T, 3.9 nm from Westfield church spire.

   Plot the 0935 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  

7. At 1135 your fix is 335°T, 1.2 nm from Heron Point Light. You steer 068°T at 4.1 kn through the water. At 1240 a new fix puts you 351°T, 2.9 nm from Mill stack.

   Plot the 1240 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1440 your fix is 025°T, 1.1 nm from Westfield church spire. You steer 123°T at 7.5 kn through the water. At 1510 a new fix puts you 020°T, 3.0 nm from Heron Point Light.

   Plot the 1510 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