Worksheet 771 · Skill 5

Set and drift

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1. At 0940 your fix is 055°T, 3.2 nm from Heron Point Light. You steer 082°T at 8.7 kn through the water. At 1010 a new fix puts you 291°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1010 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  

2. At 1200 your fix is 068°T, 4.7 nm from Tern Island tower. You steer 219°T at 8.3 kn through the water. At 1235 a new fix puts you 242°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1235 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  

3. At 1005 your fix is 218°T, 2.5 nm from Tern Island tower. You steer 294°T at 5.8 kn through the water. At 1100 a new fix puts you 043°T, 2.1 nm from Westfield church spire.

   Plot the 1100 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  

4. At 1515 your fix is 345°T, 0.9 nm from Heron Point Light. You steer 350°T at 5.4 kn through the water. At 1600 a new fix puts you 041°T, 1.4 nm from Westfield church spire.

   Plot the 1600 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 1300 your fix is 254°T, 1.9 nm from Gannet Rock daybeacon. You steer 036°T at 4.4 kn through the water. At 1415 a new fix puts you 056°T, 3.6 nm from Tern Island tower.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1030 your fix is 320°T, 3.1 nm from Tern Island tower. You steer 256°T at 5.4 kn through the water. At 1105 a new fix puts you 042°T, 4.0 nm from Westfield church spire.

   Plot the 1105 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 1445 your fix is 057°T, 3.2 nm from Heron Point Light. You steer 353°T at 5.2 kn through the water. At 1525 a new fix puts you 303°T, 2.9 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0800 your fix is 002°T, 1.2 nm from Gannet Rock daybeacon. You steer 146°T at 4.2 kn through the water. At 0855 a new fix puts you 086°T, 2.8 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn