Worksheet 599 · Skill 5

Set and drift

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1. At 0715 your fix is 306°T, 3.7 nm from Mill stack. You steer 066°T at 6.6 kn through the water. At 0815 a new fix puts you 018°T, 0.8 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0855 your fix is 359°T, 1.8 nm from Mill stack. You steer 008°T at 4.9 kn through the water. At 0935 a new fix puts you 261°T, 1.9 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1020 your fix is 027°T, 2.6 nm from Westfield church spire. You steer 155°T at 5.9 kn through the water. At 1130 a new fix puts you 349°T, 2.9 nm from Mill stack.

   Plot the 1130 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1405 your fix is 277°T, 2.7 nm from Tern Island tower. You steer 233°T at 4.6 kn through the water. At 1455 a new fix puts you 164°T, 1.3 nm from Westfield church spire.

   Plot the 1455 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 1105 your fix is 022°T, 2.0 nm from Tern Island tower. You steer 256°T at 6.3 kn through the water. At 1220 a new fix puts you 037°T, 3.7 nm from Westfield church spire.

   Plot the 1220 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 1330 your fix is 017°T, 0.8 nm from Gannet Rock daybeacon. You steer 267°T at 6.0 kn through the water. At 1450 a new fix puts you 091°T, 2.0 nm from Westfield church spire.

   Plot the 1450 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1300 your fix is 315°T, 2.4 nm from Tern Island tower. You steer 234°T at 4.3 kn through the water. At 1405 a new fix puts you 038°T, 1.1 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1500 your fix is 026°T, 2.6 nm from Heron Point Light. You steer 088°T at 9.0 kn through the water. At 1530 a new fix puts you 259°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1530 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