Worksheet 724 · Skill 5

Set and drift

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1. At 1240 your fix is 296°T, 3.6 nm from Tern Island tower. You steer 211°T at 4.8 kn through the water. At 1345 a new fix puts you 126°T, 1.2 nm from Westfield church spire.

   Plot the 1345 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  

2. At 1450 your fix is 043°T, 1.1 nm from Heron Point Light. You steer 357°T at 6.2 kn through the water. At 1545 a new fix puts you 042°T, 3.4 nm from Westfield church spire.

   Plot the 1545 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  

3. At 1545 your fix is 347°T, 1.2 nm from Gannet Rock daybeacon. You steer 210°T at 5.3 kn through the water. At 1620 a new fix puts you 222°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1620 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 1230 your fix is 301°T, 4.6 nm from Tern Island tower. You steer 168°T at 7.5 kn through the water. At 1300 a new fix puts you 093°T, 3.2 nm from Westfield church spire.

   Plot the 1300 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 1300 your fix is 081°T, 3.0 nm from Westfield church spire. You steer 163°T at 6.9 kn through the water. At 1340 a new fix puts you 334°T, 1.9 nm from Mill stack.

   Plot the 1340 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  

6. At 1030 your fix is 055°T, 3.3 nm from Westfield church spire. You steer 128°T at 6.6 kn through the water. At 1100 a new fix puts you 260°T, 1.7 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1425 your fix is 046°T, 4.1 nm from Westfield church spire. You steer 146°T at 6.5 kn through the water. At 1510 a new fix puts you 239°T, 1.4 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1455 your fix is 040°T, 1.7 nm from Westfield church spire. You steer 088°T at 5.1 kn through the water. At 1525 a new fix puts you 270°T, 3.2 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn