Worksheet 383 · Skill 5

Set and drift

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1. At 1140 your fix is 280°T, 3.7 nm from Tern Island tower. You steer 202°T at 6.8 kn through the water. At 1210 a new fix puts you 024°T, 1.1 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1530 your fix is 032°T, 4.2 nm from Westfield church spire. You steer 135°T at 4.7 kn through the water. At 1605 a new fix puts you 280°T, 3.7 nm from Tern Island tower.

   Plot the 1605 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 1440 your fix is 305°T, 1.0 nm from Gannet Rock daybeacon. You steer 068°T at 4.1 kn through the water. At 1540 a new fix puts you 042°T, 4.4 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1105 your fix is 045°T, 2.1 nm from Westfield church spire. You steer 120°T at 9.0 kn through the water. At 1135 a new fix puts you 053°T, 3.5 nm from Heron Point Light.

   Plot the 1135 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 1315 your fix is 194°T, 1.9 nm from Tern Island tower. You steer 215°T at 4.8 kn through the water. At 1400 a new fix puts you 354°T, 2.4 nm from Mill stack.

   Plot the 1400 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  

6. At 0825 your fix is 080°T, 1.5 nm from Heron Point Light. You steer 330°T at 7.1 kn through the water. At 0915 a new fix puts you 000°T, 2.6 nm from Westfield church spire.

   Plot the 0915 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 1330 your fix is 352°T, 2.9 nm from Mill stack. You steer 061°T at 6.9 kn through the water. At 1405 a new fix puts you 143°T, 2.4 nm from Tern Island tower.

   Plot the 1405 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  

8. At 1515 your fix is 053°T, 2.6 nm from Westfield church spire. You steer 205°T at 6.3 kn through the water. At 1545 a new fix puts you 156°T, 1.8 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn