Worksheet 744 · Skill 5

Set and drift

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1. At 0850 your fix is 354°T, 1.6 nm from Heron Point Light. You steer 344°T at 6.6 kn through the water. At 0930 a new fix puts you 019°T, 2.3 nm from Westfield church spire.

   Plot the 0930 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  

2. At 0910 your fix is 262°T, 2.7 nm from Gannet Rock daybeacon. You steer 069°T at 4.9 kn through the water. At 1000 a new fix puts you 027°T, 3.2 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1450 your fix is 093°T, 1.4 nm from Gannet Rock daybeacon. You steer 304°T at 4.4 kn through the water. At 1520 a new fix puts you 137°T, 2.7 nm from Tern Island tower.

   Plot the 1520 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 1120 your fix is 022°T, 2.0 nm from Mill stack. You steer 353°T at 7.4 kn through the water. At 1210 a new fix puts you 293°T, 3.6 nm from Tern Island tower.

   Plot the 1210 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  

5. At 0820 your fix is 004°T, 1.8 nm from Mill stack. You steer 350°T at 8.1 kn through the water. At 0900 a new fix puts you 295°T, 3.4 nm from Tern Island tower.

   Plot the 0900 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 0720 your fix is 061°T, 1.4 nm from Gannet Rock daybeacon. You steer 273°T at 4.3 kn through the water. At 0815 a new fix puts you 294°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 0815 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  

7. At 0745 your fix is 032°T, 3.8 nm from Gannet Rock daybeacon. You steer 281°T at 8.2 kn through the water. At 0840 a new fix puts you 294°T, 3.5 nm from Tern Island tower.

   Plot the 0840 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  

8. At 1505 your fix is 043°T, 1.9 nm from Westfield church spire. You steer 101°T at 4.8 kn through the water. At 1540 a new fix puts you 258°T, 3.2 nm from Tern Island tower.

   Plot the 1540 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