Worksheet 619 · Skill 5

Set and drift

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1. At 1005 your fix is 310°T, 1.6 nm from Tern Island tower. You steer 237°T at 5.9 kn through the water. At 1055 a new fix puts you 136°T, 1.2 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0950 your fix is 217°T, 3.4 nm from Tern Island tower. You steer 355°T at 6.9 kn through the water. At 1030 a new fix puts you 309°T, 3.4 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  

3. At 0830 your fix is 198°T, 1.7 nm from Gannet Rock daybeacon. You steer 304°T at 4.1 kn through the water. At 0950 a new fix puts you 286°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0950 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  

4. At 0930 your fix is 069°T, 4.4 nm from Tern Island tower. You steer 242°T at 4.3 kn through the water. At 1000 a new fix puts you 012°T, 1.9 nm from Gannet Rock daybeacon.

   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 1550 your fix is 138°T, 0.9 nm from Gannet Rock daybeacon. You steer 261°T at 4.3 kn through the water. At 1655 a new fix puts you 038°T, 2.9 nm from Heron Point Light.

   Plot the 1655 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 0940 your fix is 245°T, 1.9 nm from Gannet Rock daybeacon. You steer 292°T at 5.6 kn through the water. At 1025 a new fix puts you 085°T, 3.1 nm from Westfield church spire.

   Plot the 1025 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  

7. At 1320 your fix is 046°T, 2.1 nm from Westfield church spire. You steer 120°T at 5.6 kn through the water. At 1350 a new fix puts you 254°T, 3.0 nm from Tern Island tower.

   Plot the 1350 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  

8. At 1340 your fix is 267°T, 2.2 nm from Tern Island tower. You steer 243°T at 6.2 kn through the water. At 1415 a new fix puts you 117°T, 1.0 nm from Westfield church spire.

   Plot the 1415 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