Worksheet 530 · Skill 5

Set and drift

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1. At 1350 your fix is 035°T, 3.9 nm from Gannet Rock daybeacon. You steer 294°T at 4.8 kn through the water. At 1440 a new fix puts you 044°T, 1.9 nm from Tern Island tower.

   Plot the 1440 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 1105 your fix is 143°T, 1.5 nm from Westfield church spire. You steer 030°T at 7.3 kn through the water. At 1140 a new fix puts you 292°T, 3.1 nm from Tern Island tower.

   Plot the 1140 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 0905 your fix is 249°T, 3.1 nm from Tern Island tower. You steer 131°T at 5.5 kn through the water. At 0935 a new fix puts you 214°T, 3.0 nm from Tern Island tower.

   Plot the 0935 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 1315 your fix is 088°T, 1.7 nm from Westfield church spire. You steer 102°T at 8.8 kn through the water. At 1345 a new fix puts you 237°T, 1.4 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0815 your fix is 078°T, 3.6 nm from Westfield church spire. You steer 224°T at 4.4 kn through the water. At 0850 a new fix puts you 348°T, 1.1 nm from Heron Point Light.

   Plot the 0850 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  

6. At 1500 your fix is 023°T, 2.7 nm from Heron Point Light. You steer 133°T at 4.0 kn through the water. At 1550 a new fix puts you 011°T, 2.2 nm from Mill stack.

   Plot the 1550 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 1205 your fix is 017°T, 2.3 nm from Gannet Rock daybeacon. You steer 179°T at 4.3 kn through the water. At 1240 a new fix puts you 106°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1240 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 1310 your fix is 266°T, 3.1 nm from Tern Island tower. You steer 173°T at 4.4 kn through the water. At 1405 a new fix puts you 096°T, 1.7 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn